Spelling!!! (not fanfic)

No title

Yeah, but why are there so many people these days who can't follow the rules of spelling...? I haven't read the whole thing, but the title itself... I really want to fix it. Ugh...!!!

An-an (if you put 'ji' in front, 'an' is also correct)
Doe-doe (in cases like doen-doen, ...
I will do it-I will do it
What did you do? - What did you say you did? (When relaying a story you heard from someone else, use "dae" instead of "de")
Anyway-anyway
Guji-Gdeui
No - no
This is it, this is it-this is it, this is it (when there is a final consonant, it is it, when there is no final consonant, it is it)
It wasn't - it wasn't (when there is a 받침, it was used, when there is no 받침, it was used)
Certainly-certainly

There are many more, but I've organized only the most basic and most common mistakes. I get a little annoyed when I see something with a strange spelling...
I hope those who are confused will take a look at it.
Um, please ask me anything you're curious about. I don't know if there's anything I'm curious about, but