Do these certificates have any usage?

Answer 1

Try using search bar of discussion forum before posting a question, there are several threads on this topic.

https://www.sololearn.com/discuss/2364887/?ref=app
https://www.sololearn.com/discuss/3033848/?ref=app
https://www.sololearn.com/discuss/1827715/?ref=app
https://www.sololearn.com/discuss/3196108/?ref=app
https://www.sololearn.com/discuss/3256813/?ref=app
https://www.sololearn.com/discuss/2090050/?ref=app
https://www.sololearn.com/discuss/3088626/?ref=app