How to get silver badge?

Answer 1

https://www.sololearn.com/discuss/1112285/?ref=app

https://www.sololearn.com/discuss/202841/?ref=app
https://code.sololearn.com/ctzdTx1yEWV1/?ref=app

Answer 2

Fully complete some more courses, Engage in asking/answering questions and participating in challenges and you will be there in no time.
Good Luck!