In my opinion, it's not so important to learn how to make particular blocks. You can always find a pattern for pretty much any block you decide you want to turn into a quilt. What you need to learn are the skills, and how to piece the basic building blocks:
1/2 square triangles (that's what your pinwheels are made from)
1/4 square triangles (picture the half-square triangle cut in half the other way, with 4 triangles of colours instead of 2)
Y-seams (lemoyne star is a good block for this)
log cabin is a good example of rectangular piecing - and an excellent place to practice getting that perfect 1/4" seam
Then you can branch into applique and curves
Oh, I forgot basics like 4-patch and 9-patch too.
So I suggest you pick a basic shape you want to learn. And then find a block ( others have posted good links for that) which uses that shape and make a few of those.
I see maminstl had the same idea as me.
Edit to add more basic building-block ideas:
flying geese
snowball blocks
rail fence
Last edited by kristakz; 03-24-2014 at 09:51 AM.