It's possible to get by with a laptop if it's for a hobby and you are just editing proxy footage in software like Premiere, but if you plan to work professionaly and need to color correct as well with 4k or native footage formats, the suggestion to use a PC is probably for the guidance if you have the budget. Looking up benchmarks for the software you will be using should be a good starting point for hardware. If you need to meet with a client at a location and possibly edit with over the shoulder feedback, nowadays you might be able to use a tablet with a mouse and keyboard via a USB hub and remote into the PC desktop using apps like Teamviewer.