Every hard section in my life ishas been the most beautieful one

Alternatively: "All of the hard periods in my life have been the most beautiful"

One of this AL-Twjehe this mean lese times was AL-Twjehe. Last year in the Sacasecondary Sschoolle ,this in 2019-2020 with Covid-19 corona virus , with all barkthe noise in the world there is a goodwas something , wgood. We all learn is Lthat life iscan easy toily end so is ant is important thing to be cute and just worry about how to be happy and make everyone around you happy . Don't waste the time , be the person you need to be .

The use of commas (,) to separate parts of a sentence should fit naturally with speech. It's something that takes time to learn, but reading along to audiobooks with the text in front of you can help identify when these natural pauses take place.

Anyway, in this year I am steadyudying hard: Physical,a MATH, ....Ectath, etc...

There are several ways to say what subjects your are studying. Using a colon (:) and then listing seemed to fit best with your original sentence.
Studying Physical what? Physical Science, Physics?

At this time, I believe in myself to be what I need to be, because the Sschool is closed and my exam is online .

Without tetachier to correct my Aanswers.

iIf you note the same maistake each time s, please tell me what is the gramaee lesson tomar is so I can review it.

Every hard sectiontime in my life is the most beautieful one.

One of thiese times was AL-Twjehe, this means the last year in the Sacaof secondary Sschoolle ,this i. This was between 2019-2020 with the Covid-19 corona virus , with all barkthe noise in the world, there is a good/ can be something , wgood. We all learn is Lt that life iscan easyily come to an end, so is anan/ the important thing is to be cute and worry about how to be happy and make everyone around you happy . Don't waste theyour time and be the person you need/ want to be .

"Secondary school" doesn't need to be capitalized. Try to create shorter sentences since this would prevent you from making a lot of mistakes and create a better flow in your writing.

"Cute" can make sense, but I'd rather use the word "lively". "Worry" makes sense, but I'd rather use the word "think".

Anyway, in this year, I am steady hard Physical,a MATH, ....Ectstudied a lot of physics, math, etc.

I am assuming you mean "physics", but you could also want to say "physical education". You could also say "... I studied physics, math, etc. hard."

At/ During this time, I believed in myself to be what I needed/ wanted to be, because the Sschool iwas closed and my exam was online .

Without (any) tetachiers to correct/ check my Aanswers.

iIf you note the same maistake each time , please tell me what is the grammaeer lesson that I need to review it.

I would recommend you review the past tense.