I want to create a new element, so I went to the wiki and it started by saying to create an element file in, src/simulation/elements but I can't find the folder. could someone please tell me how to get there?
Basically, if you download TPT, it doesn't actually come with its source code - which you'll need if you want to start making C++ mods. You can acquire it on GitHub with the "Download ZIP" button near the bottom right corner of your screen.
When you download it and extract the ZIP file somewhere, you'll find in it a ton of files - the files related to elements are inside the subfolders src/simulation/elements.