The search for "Autodesk Fusion 360 -portable-.rar" typically indicates a desire for a version of the software that can be used without the need for a traditional installation process. Portable software is designed to be self-contained, allowing users to run the application directly from a portable storage device, such as a USB drive, without leaving a footprint on the host computer.
Using the Autodesk Fusion 360 Portable.rar is relatively straightforward: Autodesk Fusion 360 -portable-.rar
You can install Fusion 360 to an external SSD and run it on different Windows PCs, but: The search for "Autodesk Fusion 360 -portable-