How to bold every link in Posts and Widgets?

To change all links, you would use:

a                   {
color:              #0088cc ;   /* Blue        */
font-weight:        normal;
}
a:hover             {
color:              #0088cc ;   /* Link Blue */
font-weight:        bold;
}

However, you want to focus on specific items, so you’d need to consider some of the following:

.blog a, .page a, .post a, .widget_archive li a, .widget_categories li a, .widget_pages li a, .widget_links li a, .widget_meta li a, .widget_nav_menu li a {
font-weight:        bold;
}

Come back with a site link if not working out.

Worked! Thanks alot!