Today is the first day I began learning katakana. I can already see some pattern. 5 letters are almost same as their hiragana counterpart. Here;
や か い に へ = (will put katakana ya ka ri ni he which are the almost same as the ones shown, can’t find a good mobile friendly transliteration)
A few I can see any how resembling partly to hiragana (eg wa, ra, ki, u … And some more .. Will add ) and couple are easy since I see that they match to kanji.
Eg katakana mi is from kanji mitsu (San) and ne is from shimesuhen. Also ma is from ko, kodomo. mu is a topographic rotation.