If you are studying for CompTia Network+ certification, a good text book for preparation is Network+ Guide to Networks (sixth edition) by Tamara Dean (ISBN# 978-1-133-60189-6). The sixth edition is updated to reflect changes in the test. This book was written specifically to prepare for the CompTIA Network+ exams. I have viewed a few sample tests and recommend studying the book for successful certification testing.
If you only want to understand IP addressing, the following topics must be understood to answer questions about IP addressing:
decimal to binary conversation and vice versa
IPv4 dotted decimal and binary formats
default subnet, subnetting, and supernetting
IPv6 hexadecimal addressing format, including shorthand addresses.
Good luck. I admire people who attempt to improve their knowledge and abilities through study.