The alphabet consists of the letters used in English.

There are uppercase and lowercase letters.
The left side is lowercase, and the right side is uppercase.
They look very similar.

"a" sounds like "ah" in "car",
and it can sound like "ah" or "eh" in "animal".

So, do I have to memorize all of them?

You don't need to memorize everything.
Anyone can do it with a little practice!
Pretty simple, right?