Hey there! Interested in learning how to open 3D OBJ files? Follow these simple steps to get started. Firstly, you'll need 3D modeling software such as Blender, Autodesk Maya, or 3ds Max. Once you have the software installed, open the program and locate the 'File' menu. From there, select 'Import' or 'Open' and browse your computer to find the OBJ file you'd like to open. Once you've selected the file, the 3D model should appear in the software, and you can start exploring and editing it to your heart's content. Good luck, and happy modeling!