Some Katakana letters are similar to one another. Especially these 2 pairs are confusing.
"シ (shi) and ツ (tsu)," and " ソ (so) and ン (n)", but if you remember how they are written, you don’t have to stay confused!
Remembers: The beginning of each stroke for "Shin" lines up vertically on the left but strokes move side way.
The other letters ソ and ツ line up at the top but strokes moves downwards!