Answer 1

nobody's a teacher here kid, solo mean alone or self.
so you're basically learning yourself here, just to inform you.
and could you specify what is wrong?
Like which course, which exercise?

Answer 2

Read these then try again:
https://www.sololearn.com/discuss/333866/?ref=app
https://www.sololearn.com/discuss/1316935/?ref=app
https://code.sololearn.com/W3uiji9X28C1/?ref=app