The letter J in braille

dots 2-4-510 of 26⠚

dots 2-4-5. Dots 1-2-3 run down the left, 4-5-6 down the right.

J in braille is dots 2-4-5. A–J use only the top four dots (1, 2, 4, 5).

A capital J has the capital sign, dot 6, in the cell before it: ⠠⠚.

In Grade 2 (contracted) braille, j standing alone as a word means “just”.

After the number sign, j is the digit 0: ⠼⠚.

Don't mix it up

H: H is J flipped left to right (dots 1-2-5). Check which column the dots are in.
G: G adds dot 1 (dots 1-2-4-5).
I: I drops dot 5 (dots 2-4).
T: T adds dot 3 (dots 2-3-4-5).

Tap the dots for J, then Enter. On a keyboard, press F D S / J K L together and let go.

J is in Letters A–J. Braille a Day brings it back tomorrow to answer from memory, then again just before you'd forget. Five minutes a day.