Help from Fellow Chess Players!

Ok first of all i just want to introduce me and how chess are!

I've been playing chess for eight years now and i am a very well rounded out player! I can be good at sometimes and just do plain horrible at other times! I have been to many tournaments, for example: 5 regional and 2 state!  So all together me and chess are combined together!

but what im asking out of this is any fellow chess players, could you give me some hints, tips, and strategies for me to get better! So openings and endings!

Thank you!