Tip #1: Read a couple of short books or a lot of online conversations. The drawback with the online conversations is that they seldom focus on normal, easy, tree felling. Let us give you advice when the tough ones come along.
Tip#2: Get a throwball setup with some good arborist rope. Using them regularly will cover a lot of other mistakes when it comes to putting trees on the ground where you want them.
Tip #3: Just learn to keep your chainsaw sharp. Always. Dull chains cut slow, they make for dangerous chainsaw habits, and they take all the fun out using a chainsaw.
Tip #4: Get some wedges, and learn how to use them, using the rope and throwball as a safety backup. Once you have it figured out, then you can use whichever method strikes you as best in any situation.
Tip #5: Throw away any thoughts of climbing a tree with a ladder. If you aren't ready to do it the right way, for goodness sake, don't even think about using a ladder to make a cut in a tree.