This shoudl be helpful for all of you that have been confused about these, or just need an overview of it all. These are very useful in almost any design :)
Tell me if it was explained well etc, comments, and of course likes/subs on youtube if you have a google account are appreciated a lot, there will be more similar content every week :)
http://www.youtube.com/watch?v=N5ogg...p;feature=plcp