sSports

"Sport" can actually be false cognate at times. German-speakers often use "Sport" in places where English-speakers would say "exercise," "sports," or "PE" (referring to the class at school). Each context is different. :) At the very least, I would capitalize "sport" here, even if you choose not to make it plural.

My big brother is really great inat sport hes, and he plays basketball and tennis .

You could also separate these clauses into two sentences:

"My big brother is really great at sports. He plays basketball and tennis."

He is really good and he make a many practices often.

In the morning he goes running 5.at 5 o'clock, and he need onlyonly needs 15 minutes.

I am not so good .I hate sport and gym and i hate running .I play onls. I hate exercise, gym class, and running. I only play in the park or ofn my handyphone.

I assumed you meant "gym class" (or "PE") here, but if you meant actually going to the Fitnessstudio, you can say this instead:

"I hate sports/exercise, gyms, and running."

In my free time I am of ywatch YoutTube, but by sport have I fun it is spring and we go often out the school.

Sorry, I'm not sure exactly what you wanted to say here! Could you write it in German? "but by sport have I fun it is spring and we go often out the school" ergibt leider keinen Sinn...

My teacher has always has funny games for us and I musthave to go to the school and w. We live ion 8 floor I must gothe 8th floor, so I have to go down the stepsairs, but we have an elevator and he does in my food chillie and I burn me always the mound that is so mean but I can do that

Sorry, this doesn't make any sense: "and he does in my food chillie and I always burn my mouth that is so mean but I can do that" Was wolltest du hier sagen?

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

Really good sounds better, as well as 'he likes to play...' or 'especially at basketball and tennis'

He is really good, and he make a many practices a lot.

'he make a many practice ' doesnt make sense, i think ^ is what you meant

In the morning, he goes running 5.clock and he needat 5 o'clock, but only for 15 minutes.

I am not so good . I hate sport and gym and i hate running .I play onls, the gym as well as running. I only like to play in the park or (of my handy.??)

didnt understand the last part

In my freetime I am of ywatch YoutTube but by sport have I fun it is spring and we go often out the. Though in the spring, I often like to play sports after school.

Didn't understand the sentence, I rewrote it into what I assumed you were trying to say

My teacher has always has a funny game for us and I must, this encourages me to go to the school and. At home we live ion 8the 8th floor, so I must go the steps butclimb stairs. Even though we have an elevator. ( and he does in my food chillie and I burn me always the mound that is so mean but I can do that???)

This is one sentence, a sentence need to be said in one breath, commas are used to indicate breaths during a sentence. So this sentence is basically impossible. Shorter sentences are easier to write and to understand as well as to get your point across. Sorry, i couldn't understand the last part, there's a bit to much jumping from topic to topic