My bigolder brother is really great in sport he andood at sports; he plays basketball and tennis .

big brother is a little bit informal (like something a child would say), so it is better to say older brother
using the ; in the space of the "and" is a stylistic decision that makes the sentence flow better

He is really good and he make a many practice.s a lot

In the morning he goes running 5.for a run at 5:00 (or 5 o'clock) and he need onlyonly needs 15 minutes.

you could also say he only takes 15 minutes

I am not so good .athletic. I hate sport ands, going to the gym, and i hate running .

I play onlonly play in the park or of my handy.

I'm not sure what this means: "or of my handy."

In my free time I am of ywatch Youtube but bor play sports. I have I fun, it is spring and we go often go out athe school.

My teacher has always has funny games for us.