The letter I in braille
dots 2-49 of 26⠊
I in braille is dots 2-4. A–J use only the top four dots (1, 2, 4, 5).
A capital I has the capital sign, dot 6, in the cell before it: ⠠⠊.
After the number sign, i is the digit 9: ⠼⠊.
Don't mix it up
Now write it yourself
Tap the dots for I, then Enter. On a keyboard, press F D S / J K L together and let go.
Remember it, don't just look it up
I 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.