To visualize complex collisions on a level, select "Player Collision" view mode and turn on "Collisions" show flag — meshes with complex collisions are filled with color. - Works in both editor/play ...
If you're completely new, I would suggest picking on a simple mod idea/goal that will teach you the basics. For example: learn how to extract game files, modify a texture/model and repackage it into a ...
This is a handy editor for binary .locres files from Unreal Engine 4. It converts a locres file to textual representation, and then it is able to recreate the similar locres file from your modified ...