18 Tutorials · DE / EN
Flutter / Dart
Learn Dart first. Then understand widgets, Riverpod and local data.
Start from zeroView learning path54 Tutorials · DE / EN
Learn to code: Tutorials
Start with no prior knowledge. Small examples explain the language. Medium guides connect building blocks. Large tutorials walk through complete project workflows.
18 Tutorials · DE / EN
React / TypeScript
Start with JavaScript. Connect React on the web and React Native.
Start from zeroView learning path18 Tutorials · DE / EN
Java
From the first program to JavaFX, Spring Boot and databases.
Start from zeroView learning pathFlutter / Dart
Small
01 · Flutter / Dart
Install Dart and run your first program
Create a text file containing Dart code and run it on your computer.
02 · Flutter / Dart
Variables, data types and missing values
Store values under names and distinguish text, numbers and booleans.
03 · Flutter / Dart
Operators and decisions with if
Compare values and execute instructions only when a condition matches.
04 · Flutter / Dart
Loops: repeat work
Process several values and stop repetition in a controlled way.
05 · Flutter / Dart
Functions, parameters and return values
Encapsulate a calculation in a reusable function.
06 · Flutter / Dart
Lists, sets and maps
Choose a suitable collection for ordered items, unique values or lookups.
07 · Flutter / Dart
Classes and constructors
Group related values into your own data type.
08 · Flutter / Dart
Null safety, errors and Future
Handle missing values and wait for an asynchronous result.
09 · Flutter / Dart
Your first Flutter interface
Build a screen from widgets and update it with a button.
Medium
10 · Flutter / Dart
Validate forms and navigate between screens
Validate input, dispose controllers and pass a confirmed value to a second screen.
11 · Flutter / Dart
Riverpod: observe and change state
Connect an interface to an explicit state owner.
12 · Flutter / Dart
Clean MVVM, services and repositories
Separate presentation, domain rules and persistence through replaceable contracts.
13 · Flutter / Dart
Understand SQL and place Drift/SQLite in context
Create tables, link records and understand transactions and migrations.
14 · Flutter / Dart
Coordinate photos, files and PDF output
Create a PDF and distinguish file storage, database references and deliberate export.
15 · Flutter / Dart
Unit and widget tests with meaningful expectations
Verify domain rules and visible behaviour rather than only code existence.
Large
16 · Flutter / Dart
A small vehicle log from UI to database
Connect a form, domain service and real local persistence into a verified workflow.
17 · Flutter / Dart
Restore encrypted backups safely
Derive a key, verify authenticity and validate all data before import.
18 · Flutter / Dart
Scanning and OCR: suggestion, confirmation and persistence
Build a testable capture workflow and separate recognised text from confirmed data.
React / TypeScript
Small
01 · React / TypeScript
JavaScript: your first program
Run a JavaScript file and understand the difference between a browser and Node.js.
02 · React / TypeScript
Variables and data types in JavaScript
Use const and let and identify text, numbers, booleans and missing values.
03 · React / TypeScript
Operators, comparisons and if
Choose between workflows based on a condition.
04 · React / TypeScript
Loops in JavaScript
Iterate over values and calculate a total.
05 · React / TypeScript
Functions and scope
Write reusable calculations and understand local variables.
06 · React / TypeScript
Arrays, objects and new values
Describe records and create changes without overwriting the old value.
07 · React / TypeScript
HTML and CSS: the foundation of a web interface
Open a simple web page and separate content from styling.
08 · React / TypeScript
TypeScript types and modules
Describe allowed data shapes and check them before execution.
09 · React / TypeScript
Promises, async/await and errors
Wait for eventual results and handle failed tasks.
Medium
10 · React / TypeScript
First React app: JSX, props and state
Render components and change state through a user action.
11 · React / TypeScript
Forms, lists and effects
Validate forms and deliberately synchronise with an external browser function.
12 · React / TypeScript
React Native, Expo and navigation
Apply React foundations to mobile views and understand native boundaries.
13 · React / TypeScript
SQLite and repositories in House Log
Understand local SQL persistence, transactions and separate device adapters.
14 · React / TypeScript
HTTP contracts and runtime validation
Distinguish transport failures, HTTP failures and invalid response data.
15 · React / TypeScript
Test components and repositories meaningfully
Verify a user action and identify failures only real database tests can find.
Large
16 · React / TypeScript
A small offline house log with React Native
Connect native input, a service and a SQLite repository replaceable between Android and tests.
17 · React / TypeScript
Persistent optimistic UI, replay and conflicts
Persist intent before sending and prevent duplicate effects when a response is lost.
18 · React / TypeScript
Shared editing with WebSockets and PostgreSQL
Understand ordered operations, reconnection and a durable operation log’s role.
Java
Small
01 · Java
Install Java and run the first program
Compile a Java file and run the resulting program.
02 · Java
Variables and data types in Java
Distinguish primitive values, text and missing references.
03 · Java
Operators and conditions
Check numbers and text using appropriate comparisons.
04 · Java
Loops and controlled repetition
Process a sequence of values using one shared rule.
05 · Java
Methods, parameters and results
Separate a calculation from its output.
06 · Java
Arrays, lists, sets and maps
Choose a collection for ordering, uniqueness or lookup.
07 · Java
Classes and constructors
Create a custom data type with controlled initial values.
08 · Java
Interfaces and composition
Define a contract and replace its implementation.
09 · Java
Exceptions and safe file access
Handle a failure and close a file even when work stops.
Medium
10 · Java
Maven, modules and ports/adapters
Understand a Java build and dependency direction.
11 · Java
Read CSV and fill PDF forms
Read structured CSV fields and set an AcroForm value using PDFBox.
12 · Java
JDBC, SQLite and local transactions
Store a record through JDBC and understand a migration’s responsibility.
13 · Java
Spring Boot REST with validation
Receive JSON, validate input and return an appropriate HTTP status.
14 · Java
Understand PostgreSQL, JPA and Flyway
Distinguish database schema, object mapping and transaction boundaries.
15 · Java
JUnit, semantic PDF tests and Testcontainers
Verify the contents of a real PDF and choose tests according to the guarantee being demonstrated.
Large
16 · Java
Offline PDF workflow with JavaFX and SQLite
Follow template, mapping, preview, background jobs and local project persistence through a real desktop app.
17 · Java
Spring Boot batch workflow with uploads and Docker
Follow a stored upload through configuration, processing, download and cleanup.
18 · Java
Idempotency, outbox and reliable retries
Recognise duplicate requests and connect a database commit to later event delivery.