Most of my tips involve more than one skill and I call it Combo xp. The tips are hard to set into one genre or another because of the mix and match xp and gp. Combining skills or using one skill to help level up another skill is the most efficient way to do most anything. More than once, when I've gotten really impatient with one thing not leveling fast enough, I remind myself that it will help me later when I can work on another skill. Maybe I saved up logs when I was woodcutting or dragon bones and hides when I was ranging and they're sitting in the bank waiting for me! Sometimes it's a pain to go to the bank so often but well worth it!