Answer 1

Note//:

[OFF TOPICS] are no longer welcomed on Sololearn Q&A platform Iredafe Owolabi

Second:->
The pro beside the avata isn't a badge. It's more of a significance to the public notifying us that the user uses a pro (professional) version of the software.
This can be a acquired by using the link below.

Try SoloLearn PRO for FREE now! No ads, learning goals and much more! https://www.sololearn.com/get-pro/

Answer 2

please use the search bar, this question have been answered

Answer 3

By paying for the Pro version.

Answer 4

It's because they purchased the pro mode, that gives you more thing, for example you can see who viewed your account and other things (or just activated the free trial)