Flask Tutorial for Beginners: Where to Begin in 2026

# app.py — your first Flask app

from flask import Flask

app = Flask(__name__)

@app.route("/")
def home():
    return "Hello, Flask!"

@app.route("/about")
def about():
    return "This is the about page."

if __name__ == "__main__":
    app.run(debug=True)

Week 1 Review:
□ Is my virtual environment active?
□ Is Flask installed correctly?
□ Does the home route return a string?
□ Is the dev server running?

Week 2 Review:
□ Can I add new routes easily?
□ Do I understand URL parameters?
□ Have I created an /about page?

Week 3 Review:
□ Do I understand the difference between
   a view and a route?
□ Can I return HTML from a view?
□ Do I know how to stop and restart the server?

Week 4 Review:
□ Have I committed my project to Git?
□ Do I have a README?
□ Do I feel ready for templates?

from flask import Flask, render_template, request

app = Flask(__name__)

@app.route("/")
def home():
    return render_template("home.html", name="Beginner")

@app.route("/greet", methods=["POST"])
def greet():
    username = request.form.get("username")
    return render_template("home.html", name=username)

<!-- templates/base.html -->
<!DOCTYPE html>
<html>
<head>
  <title>{% block title %}My App{% endblock %}</title>
</head>
<body>
  <nav>
    <a href="/">Home</a>
  </nav>
  <main>
    {% block content %}{% endblock %}
  </main>
</body>
</html>

<!-- templates/home.html -->
{% extends "base.html" %}
{% block title %}Welcome{% endblock %}
{% block content %}
  <h1>Hello, {{ name }}!</h1>
  <form method="POST" action="/greet">
    <input name="username" placeholder="Your name" />
    <button type="submit">Greet me</button>
  </form>
{% endblock %}

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///app.db"
db = SQLAlchemy(app)

class Note(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(120), nullable=False)
    body = db.Column(db.Text)

with app.app_context():
    db.create_all()

from flask import jsonify, request
from app import app, db, Note

@app.route("/api/notes", methods=["GET"])
def list_notes():
    notes = Note.query.all()
    return jsonify([
        {"id": n.id, "title": n.title, "body": n.body}
        for n in notes
    ])

@app.route("/api/notes", methods=["POST"])
def create_note():
    data = request.get_json()
    note = Note(title=data["title"], body=data.get("body", ""))
    db.session.add(note)
    db.session.commit()
    return jsonify({"id": note.id}), 201

Month 1 — Basics:
Week 1 — Install Flask, first "Hello World"
Week 2 — Routes, URL parameters, methods
Week 3 — Jinja2 templates & inheritance
Week 4 — Forms and flash messages

Daily routine:
9:00 AM — Learn concepts (1 hour)
11:00 AM — Hands-on coding (2 hours)
2:00 PM — Read docs (30 min)
5:00 PM — Notes + reflection (30 min)

Milestones:
□ Flask installed and running
□ First app deployed locally
□ Can add routes and templates

Month 2 — Projects:
Week 5 — Flask + SQLAlchemy (CRUD)
Week 6 — User authentication basics
Week 7 — JSON APIs with jsonify
Week 8 — Deploy to Render or Railway

Daily routine:
9:00 AM — Concept (1 hour)
11:00 AM — Hands-on build (2-3 hours)
3:00 PM — Debug and test (1 hour)
5:00 PM — Documentation (30 min)

Milestones:
□ Working CRUD app
□ Login and protected routes
□ Deployed live URL

Month 3 — Portfolio & Interviews:
Week 9  — Capstone project (full app)
Week 10 — Clean up code + README
Week 11 — Interview prep and mock sessions
Week 12 — Apply to Flask/Python roles

Daily routine:
9:00 AM — Project work (2 hours)
11:00 AM — Interview practice (1 hour)
2:00 PM — Applications (1 hour)
5:00 PM — Review and notes (1 hour)

Milestones:
□ Capstone deployed and on GitHub
□ Clean README with screenshots
□ 30+ applications sent

Daily Tracker:
Date: _________
☐ Morning routine completed
☐ Learning (1 hour)
☐ Hands-on coding (2 hours)
☐ Read Flask docs (30 min)
☐ Notes + reflection (30 min)
☐ Exercise completed
☐ Reviewed progress
☐ Planned tomorrow

Today's Accomplishments:
1. 
2. 
3. 

Tomorrow's Priorities:
1. 
2. 
3. 

Weekly Tracker:
Week: _____ (Month 1 / 2 / 3)

Goals for this week:
1. 
2. 
3. 

Daily Progress:
Mon: ☐☐☐
Tue: ☐☐☐
Wed: ☐☐☐
Thu: ☐☐☐
Fri: ☐☐☐
Sat: ☐☐☐
Sun: ☐☐☐

Weekly Wins:
1. 
2. 
3. 

Challenges & Solutions:
1. 
2. 

Next Week's Goals:
1. 
2. 
3. 

Monthly Tracker:
Month: _____ (1 / 2 / 3)

Monthly Goal:
_______________________________________________

Week 1 Progress: ☐☐☐
Week 2 Progress: ☐☐☐
Week 3 Progress: ☐☐☐
Week 4 Progress: ☐☐☐

Monthly Wins:
1. 
2. 
3. 

Skills Gained:
1. 
2. 
3. 

Projects Completed:
1. 
2. 
3. 

Applications Sent: _____
Interviews: _____
Offers: _____

Next Month's Goal:
_______________________________________________