Swimming help!!!???????????????

Question

ok i am planning on doing swim team this year and throughout high school. im going into eighth grade and i want to be on the swim team before highschool so i can be better at swimming. i used to be on a swim team but i quit. i know the basics but i need help on breaststroke and butterfly.

what are good techniques for butterfly?

What are good techniques for breaststroke?

also i have trouble breathing when im swimming so what can i do to help?

What are good training excersises for swimming?

thanks soooo much.