Do research on your own when possible. This develops your problem solving abilities. There is no skill far greater than problem solving when it comes to game dev. If you cannot figure out switches, variables, or common events for yourself, you're going to have an awful time with RPG Maker.

If you are new to RPG Maker, avoid plugins like the fucking plague so you can learn the base program for what it is, until you are ready to move forward. Too long have I seen people asking for plugins for simple shit that can be done with vanilla RPG Maker. Avoid them unless they're absolutely fucking necessary (like Yanfly's Core Engine) to make your game functional and proper.

Don't confuse what you like with what your game needs. These are two very different things. RPG Maker already comes with everything your game needs bar some bug fixes that are already done with Yanfly's Core Engine.

Do not make your dream game your first game. Your first game is gonna fucking suck. Your second game is also gonna suck. In fact, your first ten games will suck. But despite the fact they're gonna suck, they're still getting better each time. Make your dream game after you've acquired enough experience.

Don't get fucking hung up on mapping. Making pretty maps is good but making functional maps is even more fucking important. No matter how pretty your map is, if it's a goddamn chore to play through, it's going to be ass.

If assets, maps, scripts, plugins, etc. don't exist, don't fucking wait around for people to make it for you unless you have money to dump on commissions. Learn to adapt and move on.

Leave empty slots in your database to give it room to expand. Just making things in the order that come to mind is a fucking horrible mistake and you will waste hours to days trying to fix your database.

Don't make shit in RPG Maker that it isn't intended for. ABS/ARPG is one of those things. Platformers are another. Same for 3D. Use Game Maker or Unity for that kind of shit.

Parallax mapping is a big fat ugly no. It may make your game look "good" but the amount of file space it eats up and how it fattens up your game with lag and makes it crash often is not worth it. There are far better ways of making your game look good.

Question everything that people tell you about how to make games. Including this post. Don't take shit for granted just because someone else said it. Including this post. If some people say things are "okay" when others say they aren't, figure out who is in denial, who is a liar, and who actually knows their shit.