In Wordle, repeating letters reveal themselves gradually, like puzzle pieces. When one letter is already uncovered (yellow or green), the second can be anywhere - it expands your search, but at the same time gives you information.
In practice, you often run into words like BOOK or HAPPY, where letters repeat in different positions. I remember getting stuck for a while on a word with two O's - first I uncovered the first O in one spot, then I blindly tried to guess the second one, wasting attempts. Turns out, I just needed to methodically check standard patterns: two letters in a row (like in SPEED), at the edges of the word, or spaced apart. After that I figured it out - don't guess, search systematically.
When you see that a letter is already accounted for somewhere, your next move is just to plug it into the remaining positions in one word. Don't jump around trying different letters, focus on one. And remember, English has patterns: doubled consonants often appear at the end (BELL, BOOK), vowels rarely repeat in a row. If a letter's rare and already uncovered - there's a good chance the second copy is somewhere nearby or at the end of the word.