Most databases let you save a reference directly to your reference manager. Look for options that may say "Export", "Import" or "Save to" and choose to save to the reference manager you are using. Use provided web browser bookmarklets to quickly save ordinary web sites as references!
Different ways to save references
Which method should I use?
Feel your way! You won't manage using only one method as none covers all databases. More complete metadata is usually received by using the databases' dedicated "Save reference" buttons than when using the reference managers' web browser bookmarklets. Do however try the bookmarklets as they, too, will come in handy.