https://www.etutor.pl/help/coins-faq
https://www.etutor.pl/forum/thread/789516-czy_mozna_zdobyc_wiecej_niz_90_monet_dziennie.html?unread
Szukanie nie boli.

Hello, we are on the english learnign site so we can speak (or try to speak) in english:) Anyway if you complete a lesson you will earn 10 coins (max 50 coins - so you have to complete five lessons). Next if you want to earn additional coins go through repetition section. Try to learn words and earn one coin for each 10 words (max 40 coins). So the total coins which you able to earn are 90 coins per day. Additional for daily login to etutor you can earn max 50 coins per 5 days. But if you set a challange (7 days earning) you can also earn 50 coins per 7 days. According to that the average incom is about 110 coins per day.

OK it was hard to explain in english but I hope you anderstand me. If not please give me a feedback.

I have been finding some small mistakes in my text when I read again the text. Here is my correct essay https://www.etutor.pl/forum/thread/812286-How_to_earn_coins_in_coins-market_challange.html

Grammar:
I used Present Perfect Continuous - why ? because when I did something, something other was appeared :) - is it correct ?