I have two in my bag. They're the original fidget toy...
You can either learn the long/hard way by intuiting how the cubes move or you can find a method.
The old "Simple Solution to the Rubik's Cube" books (you can probably find one used for cheap) is basically solve by layers: Solve the top, solve the middle edges, solve the bottom. It's very iterative and not efficient but it gets the job done.
The most "common" solution system is CFOP. Solve a cross, insert paired corner/edges for the first two layers (F2L), Orient the last layer (OLL, basically get the bottom color solved), permute the last layer (PLL, basically fix what's mis aligned.) There's a simple notation to learn for which side to rotate, but it takes some getting used to. But advanced CFOP really needs you to memorize lots of patterns, about 57 of them. There's a simpler less efficient version of CFOP that is still faster than many methods, that means you only need to memorize about 14 patterns (and many are paired, so it's more like 8 patterns), it's called 2LOOK. You can find videos on it about the web, and several sites show the patterns for 2LOOK and CFOP. Ruwix, cubewhiz, etc have information on the notation used, and the algorithms that you memorize (really you memorize a recognition of the pattern, then you execute one of the algorithms by muscle memory). There was a Gizmodo article where someone went from not being able to solve the cube to learning 2LOOK and doing it in under a few minutes. Unless you intend to become a speedcube competitor, 2LOOK will probably get the job done.