sql - when to use clustered index and when to use nonclustered index

Thanks for giving the time to read my question .
i have a question in my mind that
**when we should use clustered and nonclustered index**.
i have searched on the internet and found that clustered index is much
faster than the nonclustered index.
but i am confused about the usage circumstances .
can you please tell me when we should use clustered and when we should
use nonclustered index.
Looking for your kind help.

Thanks in advance .
Pooja