What are the best beauty tips you've got?

I'm not that pretty and I really want to look good! Please tell me EVERYTHING there is to know about beauty. If you can please answer these questions:
1. How to get rid of black circles under your eyes fast
2. How to make your nails really strong and not chip and peel.
Please tell me beauty tips about hair, skin, nails and how to keep a good figure.
I don't mind if it's long but please add all the information you know about them and how to keep them good.
PLEASE ANSWER!!!!!!!!!!

Also no make up or heat appliances!!