I spend all my free time on learning.

I also studying video editing.

I saw the other corrections and there is nothing wrong with them this is just another option

I can say that when I'm learning premier pro or after effects I don't get tiered.

The first part is not necessary and sounds odd.
If you wanted you could say "Let me tell you"

I can spend many hours on vidieo editing.

There is nothing wrong with this but if you said "I can spend many hours editing videos" it would sound a bit better.

True, I feel pain in my back.

You could also say "true, my back hurts"

After all I need some rest.

Especially for my eyes and back.

I spend all of my free time on learning.

You did well; however, you would say, "I spend all of my free time learning."

I am also studying video editing.

I can say that when I'm learning pPremier pe Pro or aAfter eEffects, I don't tiered.

I can spend many hours on vidieo editing.

True, I feel pain in my back.

After allwards, I need some rest.

What I Do When I Feel Tired of Learning

What I Do When I Get Tired of Learning

I spend all my free time on learning.

I'm also studying video editing.

I can say that when I'm learning premiere pro or after effects I don't get tiered.

I can spend many hours on vidieo editing.

True, I feel pain in my backmy back gets really sore.

After all I do need some rest, especially for my eyes and back.

A comma precedes “especially” because this adverb is introducing a parenthetical element to add additional information about the main clause, particularly at the final sentence.