Am I doing the correct thing?

wassup, Im 19. First I have a question about fitness. I
heard that is not good locking your elbows or something like that when lifting
weights. For example like, doing a push up is not good to go all the way up. For the past.... um... about six weeks I’ve been lifting a 15 pound weight doing a lot of reps (at home). I started with doing 20 hammer curls in which I go back and think and I have definitely locked my arm (put my arm straight when going down. Go all the way down). Then 20 low curls (not the whole curl, stop at half way of the curl while going up, it supposedly works out your biceps more.) then 20 high curls (vice-versa of the low curls but supposedly works your forearm), then I do 20 full curls. I do all those consecutively with out resting between them. Then I do another set. My right arms especially feels kind of fatigue but I want to know if it’s healthy what I\'m doing. I see improvement of course I’m up to 45 on each with the 15 pound. I don’t want to end up having elbow problems in the future. And the sports question is, what kind of exercise could I do to increase my jumping abilities. I play basketball. I’m 6\'2\" and barely could dunk. (I know ridiculous). Thank you for your time and attention, I really appreciate it.
 
Answer to Locking-out the joints...

Locking-out the joint is bad on certain exercises.
Push-ups or Bench Press for example are bad- do to the fact that you will place all that pressure onto your joints.
Lat Pulldowns or Pull-ups are fine- there is no opposing stress place onto your joints during that range-of-motion.
I hope that gives you an idea- I'll be happy to help you out on anything else...

For you jumping abilities- it takes a bit of time.
Your typical response would be plyometric jumps, squat jumps and etc.
You really need to learn to control (stabilize) your motions first before expecting to perform optimally. You don't want to improve, you want to excel on a continous basis...
 
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