I need some help and Suggestions

Hello my name is Luis 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 (Home exerice also) 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.
 
Squats, weighted calf raises and squat thrusts will improve your vertical leap. I have a friend who is 6'9" now, he could only just dunk 10' at 6'8"! You should never go to full lock on any exercise as it can put great strain on the joint.
 
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