The braille alphabet
Each braille letter is a pattern of raised dots in a cell two dots wide and three tall, numbered 1-2-3 down the left and 4-5-6 down the right. The alphabet is built in rows: learn the first ten letters and the rest follow a rule. Pick a letter to see its dots, the letters it's mistaken for, and try writing it.
A–J
Only the top four dots.
K–T
The same shapes as A–J, plus dot 3.
U–Z
A–E plus dots 3 and 6. W, added later, is J plus dot 6.
This is Unified English Braille (UEB). The letters a–z are the same in almost every braille code that uses the Latin alphabet.