I'm just typing off the cuff, but the favourite questions in no particular order are.
Which language should I learn first?
Which language is the best?
Now that I have done Course X, what should I do next?
How do I confirm my email?
Are there any value in the certificate?
Can I mention the Sololearn certificate in my CV?
I am (10, a Thesbian, a Philosophy student, in a wheelchair)[pick 1 or many] can I learn to programme?
Feel free to add the ones I've missed.
A FAQ would really help.
This is already being worked on. It'll be implemented in the near future and continue to be updated. It's the reason you see gold moderators marking questions with [DUPLICATE] and [OFF-TOPIC], etc. We're preparing the Q/A for an update that will be implemented soon.
It is an excellent FAQ, athough it needs to be more prominent.
For instance, in the place where questions get typed, there should be a statement plus a link to the FAQ.
The statement should ask the user whether he has read the FAQ.
Something like that.