The gap closes here
Learn to code by building.
A guided, project-first path from your first line of Python to production software.
// close the gap.
Variables & Values
12 min lesson3 exercises
print("Hello, world!")Output
$ python main.py
Press Run to execute this demonstration.
Your learning path
Demonstration state- Values, Expressions, and Input: PracticeCompleted · 44 min · 5 exercises
- Decisions and Repetition: ConceptsNow · 40 min · 4 exercises
- Decisions and Repetition: PracticeUp next · 46 min · 5 exercises
- Foundation Milestone: ConceptsUp next · 42 min · 4 exercises
- Lists, Dictionaries, and Tuples: ConceptsLocked
- Python
- Git
- SQL
- Web
- Deployment
The path · 9 phases · 36 weeks
A curriculum with a shape
Nine phases carry you from your first program to shipping production software. Pick a phase to see where it leads.
Phase · Foundation
Programming Foundations
Start from zero with Python syntax, values, control flow, and habits for steady practice.
- Weeks
- 4
- Lessons
- 8
- Milestone
- 1
- Getting Started with Python2 lessonsStart here
- Values, Expressions, and Input2 lessons
- Decisions and Repetition2 lessons
- Foundation Milestone2 lessons · ★ milestone
Beyond Python
Choose your path
Start with a goal-oriented pathway or explore any language. Courses are honestly marked available or planned — no placeholders.
- Software Engineering FoundationsPathway status: StartableStart with the current Python-led software engineering course and branch into supporting tools later.
- Web DevelopmentPathway status: StartableA planned web path combining page structure, styling, browser programming, and typed application work.
- Backend and APIsPathway status: StartableUse Python first, then expand toward data and backend systems languages.
- Systems ProgrammingPathway status: PlannedA planned path for compiled languages, memory, and systems-level programs.
- Data and DatabasesPathway status: StartableCombine Python foundations with relational data and future analysis courses.
- Mobile DevelopmentPathway status: PlannedA planned mobile path for native and cross-platform application foundations.
How you learn
Practice first, not video first
You spend more time writing and running code than watching it. Every lesson moves the same way — and ends with feedback that explains the why.
- Explain
Read the idea, briefly.
- Predict
Guess the output first.
- Write
Type it yourself.
- Run
Execute and see.
- Understand
Feedback explains why.
- Build
Apply it in a project.
Predict, then run
Predict the output, then press Run. This is a fixed demonstration, not a live runtime.
Milestone projects
Every phase ends in something real
Skills only count when you can apply them. Each phase closes with a scoped project you actually build.
- Phase 01 · Milestone
Your first complete program
A small program you wrote end to end — input, logic, and output that runs.
Unlocked through the course
- Phase 04 · Milestone
A working API
A backend service that accepts requests and returns real, structured responses.
Unlocked through the course
- Phase 06 · Milestone
A persistent-data application
An app backed by a database, where the data you create is still there tomorrow.
Unlocked through the course
- Phase 09 · Milestone
A capstone you can show
A portfolio-ready project that proves you can build and ship on your own.
Unlocked through the course
Why “Defitsiit”
Close the gap.
Every skill begins as a gap between what you can do today and what you want to build. Defitsiit names that gap plainly — and closes it through deliberate practice, not passive watching.
Start where you are.
A project-first path from programming fundamentals to production software.