1. 1Up next()"'Parentheses and quotesAbout 3 min★★★★★
2. 2[]{}[ ] and { }About 3 min★★★★★
3. 3=+-+3Assignment and arithmeticAbout 2 min★★★★★
4. 4<>!+2Comparison and logicAbout 2 min★★★★★
5. 5?:;Common symbol pairsAbout 3 min★★★★★
6. 6_Naming stylesAbout 2 min★★★★★
7. 7def add(a, b): return a + b def greet(name="world"): return f"Hello, {name}!" puFunctionsAbout 3 min★★★★★
8. 8if score >= 80: elif score >= 60: else: for i in range(10): for i, item in enumeif and forAbout 3 min★★★★★
9. 9class User: def __init__(self, name, age): self.name = name @property public claClasses and typesAbout 3 min★★★★★
10. 10try: value = int(text) except ValueError as e: print(f"error: {e}") finally: raiError handlingAbout 3 min★★★★★
11. 11ls -la cd ~/projects mkdir -p src/main cp config.yml config.yml.bak rm -rf buildThe terminalAbout 2 min★★★★★
12. 12git status git add -A git commit -m "fix: handle empty input" git push origin maGitAbout 2 min★★★★★
13. 13SELECT * FROM users; SELECT id, name FROM users WHERE age >= 20; SELECT COUNT(*)SQLAbout 4 min★★★★★
14. 14{ "name": "my-app", "version": "1.0.0" } { "scripts": { "dev": "next dev", "testJSON and config filesAbout 3 min★★★★★
15. 15https://example.com https://example.com/search?q=typing&page=2 http://localhost:URLs, paths and email addressesAbout 3 min★★★★★
16. 16from collections import Counter def top_words(text, n=3): words = text.lower().sWrap-up: a small programAbout 3 min★★★★★

Syllabus

1. Parentheses and quotes　The ( ) of function calls and the " ' of strings: the symbols you type most in any language.
2. [ ] and { }　The [ ] of arrays and lists, and the { } of blocks and dictionaries.
3. Assignment and arithmetic　Practice = and the arithmetic operators, plus += and ++.
4. Comparison and logic　Practice == != <= >= and && || !.
5. Common symbol pairs　Two-symbol combinations: => -> :: ?. ?? ? : and more.
6. Naming styles　camelCase, snake_case, UPPER_CASE and other naming styles. Get used to Shift.
7. Functions　Defining and calling functions, side by side in Python, Java and JavaScript.
8. if and for　Conditions and loops. Get used to the colon at the end of a line and ( ; ; ).
9. Classes and types　Classes, constructors, type annotations and the @ of decorators and annotations.
10. Error handling　try / catch / except and throwing errors.
11. The terminal　File commands, and chaining commands with | > >>.
12. Git　The git commands you type every day.
13. SQL　SELECT, INSERT, UPDATE and other SQL you write against a database.
14. JSON and config files　JSON, YAML, .env and other config file formats.
15. URLs, paths and email addresses　URLs and file paths full of / : . @ ? & =.
16. Wrap-up: a small program　A small word-counting program in Python and JavaScript, using every symbol so far.