Is Mark Down a Good Editing Tool?

i use t s code for something completely different, and probably almost everyone else does that. Shift three times, i don't know, after get what it is, or something, and it pops up b s code in the middle of your project right there. Its pretty bas not shift three times. E, i did not realize it had to mark down previous is that extension that you put in, there's one built in. And those a couple of extension ores i have. I have two sed upbut i think i just ye falling back.