Prepositions for and to

hi there, can anyone help me with these two prepositions?
When do I use for or to?
Example:
Can you do that for me?
or
Can you do that to me?

It would be "Can you do that for me?"

Example of using TO in a similar sentence

"I can't beleive you did this to me!"

Random Examples I thought of...

Today I went to work for 8 hours.

I need to help Anthony with his test for tomorrow.

I answered the phone for my friend.

Parking here is for residents only.

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Some examples!