Property money

Hello,

If i sell my house do i have to pay tax on below points.

1) I have to pay tax on capital gain or total sell amount ???

2)  To save tax, do I need to invest capital gain in other proprty or total sell amount ?

3) If i have to invest capital gain in other property, can i use rest of the sell amount for my personal use? Do i have to pay tax for it?

Please clear above doubts.