This is an excellent textbook used by many high schools, vo-tech institutes, colleges and universities throughout the United States. This book is easy to understand by anyone. The illustrations are clear and include worked out problems. This is a college level engineering course so don't become overwhelmed with the math. Do you need math skills to understand electronics.
All sciences including electronics requires a certain understanding of mathematics.
If you are interested in electronics only as a hobby or as an electronic technician then general math is all you need to get by. If you are serious about becoming an electrical engineer you will need advanced mathematics training through calculus. See our mathematics section. This is a good link but some browsers have trouble with it. If it doesn't come up for you try the URL in another browser.