Q1. How do you center text horizontally?

Use text-align: center; on the parent element.

Q2. How do you center a block element?

Set a fixed width and use margin: 0 auto;

Q3. How do you center with position absolute?

Use top: 50%; left: 50%; transform: translate(-50%, -50%);

Q4. How do you center with flexbox?

On parent: display: flex; justify-content: center; align-items: center;

Q5. How do you vertically align text?

For single line, use line-height equal to container height. For multi-line, use flexbox or padding.