Hey, I’m not here to be a pretentious jerk. I am just going to keep a running list of common mistakes I hear almost every day. I appreciate when people tell me how to speak correctly, so I figured I’d do the same. All of these I’ll double check on Google, so this is for sure correct information. Some of this stuff I wasn’t 100% sure about, so there is no shame in not knowing. I have no authority in this context; I’m just a fellow dingus who happens to have listened in English class in seventh grade and who has developed a slight obsession with the mechanics of the English language.

1. It’s “attuned to” if you’re using it in the context of something being accustomed or acclimatized to something. It’s not “in tune to” or “in tune with,” even though that could work in its own way. The word you’re most likely thinking of in those contexts is attuned.
2. Okay … you don’t say something like “there were less people there last night.” You would say fewer people. If they’re objects that can be counted, you use fewer; if it’s something like milk or sand — stuff that can’t be quantified — you use less.
3. This one’s basic, but I see it misused all the time. Your is the possessive of you, meaning that it indicates ownership over whatever you’re talking about. It’s “you’re” if you are going to do something. I actually see people mess this one up to the extent that they use you’re when they could use your, so things are getting really crazy out there. You’re going to mess up your reputation as an English speaker!
4. This one has cropped up more recently in my memory. This mistake has become increasingly prevalent as Gen-Z has come into young adulthood. NEVER SAY “MORE TALLER THAN” OR “MORE GREATER THAN” OR “MORE BETTER THAN” OR ANYTHING OF THAT NATURE. If you use the word “more,” take off the “-er” at the end of the next word. If you’re going to use the -er word, then that baby can stand ALONE. Just say “he’s taller than my dad” or whatever. This is very basic English, so getting it wrong in a job interview or something would look…not great.
5. This one is a doozy because it sounds wrong. If you’re comparing something or someone to yourself, you should say something like “she can jump higher than I.” I know that it sounds crazy. but think about it. Fill in the sentence if it were to continue — “she can jump higher than I can jump.” You wouldn’t say “she can jump higher than me can jump.” Just typing that sent a chill down my spine.
6. It’s supposedly; supposably isn’t a word.
7. The abbreviation of etcetera is etc. not ect.
8. Theirselves is not a word.
9. Irregardless is not a word.
10. You put a comma before a coordinating conjunction (for, and, nor, but, or, yet, so) when it connects two independent clauses. Independent clauses are called independent because they can stand alone as their own sentences.

This is a living document. I’m going to update it as they come to my attention. I’m not saying that I’m perfect, but I do know basic grammar rules. Maybe this can help somebody!