Learn DeepSeek AI Practically
Use DeepSeek to explore complex reasoning, mathematics, coding and document problems—then convert every proposed answer into something testable, reproducible and safe.
What You Will Be Able to Do
Use DeepSeek for disciplined problem-solving rather than trusting impressive-looking reasoning.
Understand
Distinguish DeepSeek's consumer chat, thinking modes, API and open model ecosystem.
Specify
Write problem prompts containing data, assumptions, constraints, format and tests.
Build & Debug
Request code with requirements, test cases, safe execution and error analysis.
Verify
Check calculations, counterexamples, edge cases, sources and reproducibility.
What Is DeepSeek?
DeepSeek is both a user-facing AI assistant and a broader model and developer ecosystem.
1 An AI Assistant for General and Technical Work
DeepSeek provides a conversational AI experience for questions, writing, coding, content creation and file reading. It is widely associated with reasoning-oriented models and open model releases that researchers and developers can study or run through supported environments.
The official chat interface, mobile application, API and downloadable model weights are different ways of using DeepSeek technology. A beginner does not need to install a model or use an API to practise the consumer chat. Developers must follow separate documentation, security and cost requirements.
2 Thinking and Non-Thinking Work
Where the interface offers different response modes, a faster mode can suit short explanations or drafting, while a thinking or expert mode can be useful for multi-step reasoning. More reasoning time does not remove the need for checking.
Quick Work
Definitions, rewriting, short summaries, idea generation and simple transformations.
Complex Work
Multi-step mathematics, code design, constraint problems, comparisons and technical diagnosis.
Verification Work
Independent calculations, tests, source inspection and human review—required in both modes.
Important DeepSeek Capabilities
Confirm current account, app and model availability before teaching a specific button or limit.
General Chat
Explain, brainstorm, write, rewrite, translate and continue work through follow-up prompts.
Reasoning
Explore multi-step problems, compare approaches and inspect assumptions or intermediate conclusions.
Mathematics
Solve and explain numerical, algebraic, logical or quantitative problems—with independent checking.
Coding
Draft, explain, review and debug code across supported languages and technical contexts.
File Reading
Use supported document uploads for questions, extraction and summaries in the official chat where available.
Internet Search
Where enabled, request current information and then open and verify the original sources.
Developer API
Integrate DeepSeek models into applications using the current official API documentation.
Open Model Releases
Researchers and technical users can explore certain released model weights and reports under their stated licences.
Web & Mobile
Use the official consumer experience on supported web and mobile platforms.
The A–P–I–F–T Prompt Formula
Technical prompting works best when the answer can be tested against explicit requirements.
3 Five Elements of a Testable DeepSeek Prompt
| Element | Meaning | Example |
|---|---|---|
| A — Answer Goal | The exact result needed | “Calculate the break-even number of learners.” |
| P — Problem Data | Known facts, values, units and context | “Fixed cost ₹40,000; fee ₹2,500; variable cost ₹700 per learner.” |
| I — Instructions | Method, assumptions and boundaries | “Show the formula; do not assume taxes or discounts.” |
| F — Format | How the response should appear | “Give calculation, interpretation and a three-row sensitivity table.” |
| T — Tests | How correctness will be checked | “Substitute the answer back into revenue and cost; test one learner below and above.” |
4 Ask for Alternative Methods
One method can hide a mistake. For suitable problems, ask DeepSeek to solve using two independent approaches and compare the results.
The Four-Check Technical Method
Turn the response from an explanation into a result that can survive testing.
Assumption Check
List explicit and hidden assumptions. Ask whether each is supported by the problem.
Independent Check
Recalculate with a trusted calculator, spreadsheet, reference or second method.
Edge-Case Check
Test zero, negative, empty, maximum, minimum, repeated and unusual inputs where relevant.
Execution Check
Run code in a safe test environment and compare actual output with expected results.
| Problem Type | Minimum Verification | Common Failure |
|---|---|---|
| Mathematics | Units, substitution, independent calculation and boundary values | Correct formula applied to misunderstood data |
| Logic | Counterexample, truth table or case enumeration | Conclusion stronger than the premises |
| Code | Syntax check, unit tests, edge cases and security review | Code looks plausible but fails or creates risk |
| Current fact | Official/primary source, date and scope confirmation | Outdated or invented detail |
| Document answer | Page/section traceability and sample verification | Summary omits a material exception |
Prompt, Test and Debug Code Safely
Generated code is a draft until it has passed your requirements and tests.
5 A Safe Five-Step Coding Cycle
State language, version, environment, input, output, constraints and prohibited dependencies.
Ask for the approach, data flow, error cases and test plan before code.
Request a small, understandable implementation with comments only where helpful.
Run it in a safe local or sandbox environment with non-sensitive test data.
Provide the exact error, expected behaviour, actual behaviour and smallest reproducible example.
Check security, validation, performance, dependencies, licences and maintainability.
Where DeepSeek Can Create Value
Choose tasks that benefit from structured reasoning and verifiable outputs.
Students
- Understand maths and science methods
- Generate practice problems
- Compare solution approaches
- Receive feedback without copying answers
Teachers & Trainers
- Create worked examples
- Build misconception-based questions
- Design debugging exercises
- Prepare verification worksheets
Business Calculations
- Break-even and margin examples
- Scenario and sensitivity analysis
- Process logic and decision tables
- Independent spreadsheet verification
Programmers
- Explain unfamiliar code
- Generate test cases
- Debug reproducible errors
- Compare technical designs
Document Work
- Extract structured information
- Summarise permitted technical files
- Identify requirements and exceptions
- Trace answers to sections
Self-Employment
- Support spreadsheet and coding tasks
- Create tested calculators
- Offer technical documentation assistance
- Build small verified prototypes
Make the Answer Prove Itself
Complete both exercises and keep a verification record.
Experiment 1: Catch a Hidden Assumption
Give DeepSeek a word problem that leaves one useful value ambiguous, such as whether GST is included.
Check whether it asks for clarification or silently selects an assumption. Request an assumption list.
Solve both plausible interpretations and explain how the result changes.
Experiment 2: Test-First Debugging
Select a simple function and write expected behaviour for normal, boundary and invalid inputs.
Ask DeepSeek for tests before implementation, then request the smallest code that passes them.
Run the tests safely, report any failure exactly and refine until expected and actual output agree.
Protect Data, Systems and Learning
Technical capability must be paired with security and intellectual honesty.
Data & Account Safety
- Use the official DeepSeek website or verified official application.
- Never paste passwords, API keys, OTPs or production secrets.
- Remove personal and client identifiers from files and error logs.
- Review current privacy, data and account controls.
- Keep API keys in secure environment configuration—not source code.
Technical Safety
- Run generated code in a controlled test environment.
- Read every shell command and file operation before execution.
- Check third-party packages and licences.
- Use backups and version control for real projects.
- Require qualified review for security or high-impact systems.
Build a Verified Problem-Solving Portfolio Item
Choose mathematics, business calculation or beginner coding.
Assignment: Problem, Solution, Tests and Reflection
Choose one authentic but non-sensitive problem and write a complete A–P–I–F–T prompt.
Request assumptions, two approaches, a proposed result and explicit tests.
Perform independent calculation or code execution, correct errors and create the final explanation.
Technical Worksheet
- Required answer: ______
- Known data and units: ______
- Unknown or ambiguous data: ______
- Constraints: ______
- Independent method: ______
- Edge cases: ______
Quality Score
- Problem definition: ___ / 5
- Assumptions and method: ___ / 5
- Independent verification: ___ / 5
- Edge cases/tests: ___ / 5
- Clarity and safety: ___ / 5
Mistakes Learners Should Avoid
Technical-looking output can be dangerously persuasive when it has not been tested.
Wrong Habits
- Providing incomplete data and accepting guessed assumptions
- Confusing long reasoning with correct reasoning
- Ignoring units, rounding and boundary conditions
- Running code or commands without reading them
- Testing only one normal input
- Placing passwords or API keys in prompts and code
Professional Habits
- Define variables, units and constraints
- Ask for assumptions before solving
- Use independent methods and counterexamples
- Write tests before or alongside code
- Execute safely with non-sensitive data
- Record actual results and corrections
Quick Quiz: DeepSeek AI
Answer all ten questions and submit.
1. What is DeepSeek in this lesson?
2. What does thinking mode guarantee?
3. In A–P–I–F–T, what does T represent?
4. What should happen when important data is missing?
5. Which is an independent mathematical check?
6. Why are edge cases important?
7. What should come before generated code?
8. Where should generated code first be executed?
9. Which information must not be placed in a prompt?
10. Who approves a DeepSeek-assisted technical result?
Remember These Six Points
Review before moving to Tool 08.
1. Define the Problem
Supply the goal, data, units, constraints and missing information.
2. State Assumptions
Make every assumption visible before calculation or coding.
3. Demand Tests
Specify substitution, counterexamples, unit tests and expected results.
4. Verify Independently
Use another method, calculator, spreadsheet, source or reviewer.
5. Execute Safely
Run code in a controlled environment with non-sensitive data.
6. Protect Secrets
Never expose passwords, API keys or confidential production information.