Lol

Start small, focus on what you like, and ignore everything else.

Most important factor is good, fresh coffee. Coffee varies so much, based on where it was grown (country, region, topography, etc.) and base on how it was processed to remove the fruit from the seed (bean). I highly suggest supporting local roasters, if at all possible.

Ideally you want to buy and store your coffee in whole bean form and grind yourself only when it’s time to brew. (Burr grinder is best but any grinder works.)

Second most important factor is ratio. Usually you’ll want to use 15:1 (water:coffee by weight in grams).

After that, it all comes down to experimentation, preference, and tweaking until you got it where you like it. This will be different for each new bag of beans you buy.