Which git reset shoul I use?

Question

There are three modes in git reset.
1. Soft reset
2. Mixed reset
3. Hard reset
I want to know in which cases I should use one of these.
Please help.

Answer 1

1. --soft: uncommit changes, changes are left staged (index).
2. --mixed (default): uncommit + unstage changes, changes are left in working tree.
3. --hard: uncommit + unstage + delete changes, nothing left