What apps can I use to code on a laptop?
There's an editor and an IDE. If you're not a web developer then you probably need an IDE not just a text editor. Visual Studio (not visual studio code) is one of my best IDE for writing C#, C++, C programs on the window's platform. If you're a unix user then you should find some other IDE like SharpDevelop(C#), CLion(C/C++) Intelij IDEA is good for java, kotlin, and python too
Visual studio code, sublime text, notepad++