What's the difference between 'to me' and 'for me'? you are the best friend ( ) me. Water is essential ( ) us. This is impressive ( ) me. etc. Thanks in advance.

First entry Well this is my very first diary. I'm seventeen years old from Japan. I'm really willing to improve my English more and more! It rained quite a lot today, so I didn't feel good today. Hope it will be sunny tomorrow.

Can I say ' I finally evened the game'? Does it make sense?