These ones are probably going to be your bread and butter in primary grades, especially prek or Kindergarten. The beauty of these is the introduction of spelling. Several of the forms have 3 or 5 blanks, so you can practice spelling sight words.
Handwriting is another great use for these. You can have your students write each new letter 5 times each. Other pages allow you to write up to 20 different numbers or letters.
How about numbers? Writing numbers is important. Practice forming your numerals with your handwriting. There are a lot of great uses for these.