Many laptops have an M.2 slot (usually intended for Wi-Fi cards or extra storage). You can buy a "M.2 Key-M to PCIe x16 Riser" adapter.
Offers higher bandwidth by connecting directly to the PCIe lanes but requires opening your laptop. diy egpu setup skacat-
An eGPU connects a desktop graphics card to a computer externally, communicating over: Many laptops have an M
Document your build with the tag #skacat-style for others to replicate. diy egpu setup skacat-