Bootstrap

1. container vs container-fluid
2. alignment
3. padding
4. margin
5. menu navbar
6. float left right
7. clearfix
8. carousal
9. bootstrap icons/font awesome
10. text color
11. text background color
12. table
13. grid structure
14. modal window
15. tab
16. cards
17. alert
18. badges
19. collapse
20. Form Group
21. buttons
22. btn-group

Ref: Introduction · Bootstrap v5.0 (getbootstrap.com)