UI/UX Concepts

• Bootstrap [based on Flex] [Earlier on float]
• Flexbox
• CSS Grid
• Float
• Angular
• Content < Padding < Border <Margin
• em vs rem vs px vs %
• inherited vs default 

• JSON vs Javascript Object - "Keys" have quotes or not

• CSS Box Model
• @Mixins

• LESS ?
• SCSS ?
• SASS ?