These are the basic knots you need to know in order to pass the requirements of becoming a Scout, Tenderfoot, Second Class, or First Class Scout. Some of them are easy even for a first timer - some of them are definitely not! I have witnessed Life and Eagle Scouts confuse, forget, and mess-up every one of them, so don't feel bad if you struggle a little bit while learning them. All knot information is taken from various knot books I have read or Internet resources - I will link to animations and step-by-step photos as I lack the free time to take dozens of pictures of my hands holding a rope.
Don't be embarassed if you need a knot review - like anything else in life, if you don't practice them occasionally you will forget them.
Finally, a shout out to an excellent site with all the common Scouting Knots -- Animated Knots by Grog.