How Many Points Per lesson ?
Welcome to Duolingo :)
Have a look in the Duolingo Wiki & FAQ (unofficial, but still amazing). It's the first link you see when you go to the discussion section of Duolingo.
You could also look in the help section. There's a link to that at the bottom of each Duolingo page.
You could also look on the wiki.
You'll probably want to have a look at the Community and discussions guide on the wiki.
Good luck :)