I explored many class in Ces at the culture festival with my friends.

I explain impressive class forThere was one class that really impressed me.

We don't usually say "I'll explain x" when writing in English.

I could play gambling such as roulette in 1-1.

I got coins before enterplaying 1-1 but I lost all of my coins soonvery quickly.

I got debtborrowed coins from mya from one of friendsiend, and now I owe a debt.

I like gambling but I am not good at gamblingit, so I will not play gambling to bete with real money.

"Gambling" doesn't need the helper verb "play."

I explored many class ines at the Culture fFestival with my friends.

Be sure to use a plural noun after the word 'many' here.

I explainwill describe a class that was impressive class forto me.

Or: "I will describe a class that impressed me"

Be sure to use 'will' to show that you are about to do something (future).

I could play gambling games such as roulette in Class 1-1.

Wow! That sounds like fun!

Instead of 'gambling games' you might also say 'casino games': "I could play casino games such as roulette" (both are correct)

I got coins before entering 1-1 but I lost all ofmy coins soonquickly.

Very good work!

"Soon" refers to something that will happen in the near future.
"Quickly" works better here to talk about the speed at which you lost your coins.

I got debtborrowed from my from one of friends.

"To get debt" is a little official, like a loan from a bank.

I like gambling but I am not good at gambling, so I will not play gambling to betgamble with real money.

Smart idea!

I like how you structured this sentence. It's very clear and logical.