CSS best practices

[afercia]

Apart from following the WordPress CSS coding standards, the CSS should also use some best practices. The first one that come into my mind (but there are a lot) are, for example:

1
Don't use element selectors if not strictly necessary. Things like
.settings-fields p.timezone-info
could be simply
.settings-fields .timezone-info

2
Don't use element selectors and also lower specificity as much as possible. Selectors like
.settings-fields .settings-field-control p
should be just
.settings-fields .description

More example welcome.