If you're a beginning reader who likes to read series books, here are a couple suggestions. Each title is the first in the series.
26 Fairmount Avenue by Tomie DePaola. The true-life adventures of the famous children's book author, including dropping out of school on the first day of kindergarten.
Catwings by Ursula K. Le Guin. Do those kittens really have wings?
McBroom Tells a Lie by Sid Fleischman. Josh McBroom, his dear wife, and their eleven children outwit mean Heck Jones by using frozen sunlight and a car that runs on popcorn.