Earlier quoted context omitted.
I have been using Vim for several years now and I still struggle with basic-level movement commands. Like, I never remember if f-h will move me to |hello or to h|ello. If those are working for you, that is great, but I appreciate some alternatives there. The usual Vim approaches ("do vimtutor!" or "practice one new command a week!") are not working for me.
> I never remember if f-h will move me to |hello or to h|ello. …Isn't the answer "neither"? If the cursor is somewhere before that `h`, then doing `fh` will put the cursor on that `h`. If you want to enter insert mode before that `h`, you would press `i`, or `a` to enter insert mode after the `h`.
In the case of 'ct', you're going to delete up until the letter, whereas in 'cf', it will include the letter you're targetting.