Is it better to style nothing at all in you html code (<b>,<strong>,location) and use css for that.

Answer 1

Generally speaking, yes. This would be best practice.

This helps reserve the higher specificity levels for overriding any cascading that seems to be misbehaving.

Further reading:

https://css-tricks.com/specifics-on-css-specificity/

Answer 2

Html is for the content, css for style. It is better.

Answer 3

Yes