Are you required to purchase the pro version of this app in order to get any sort of certificates?

Answer 1

No,
Everyone Has A Chance To Earn Certificates from Sololearn (Pro & Non Pro)!

Answer 2

Complete any certificate and find out.. but honestly speaking the certificates don't matter, the main thing is that you learn something

Answer 3

No, you can learn all for free and got certificate. But some practice are only for pro members (most practice can be unlocked with bits)

Answer 4

PanicS is correct but very least of the practice can be unlocked with bits. as it gets emptied very fast