Where can I learn Mathematics for making projectiles, etc.?

Hello there! This question is not about an error in my script since I am already familiar with Lua, especially OOP. But I have the last problem with scripting, which I have less practice with Mathematics. I'm going to continue developing my Roblox magic game, and this would heavily impact how I script projectiles since I have less knowledge yet. Where can I learn Basic Algebra, Geometry, and Trigonometry for free? I tried to search for lessons on Google, and I'm confused about their usage since it assumed I already know about the basics. Thank you for your suggestion!