WSL is pretty good these days. Dual boot with Windows is still a pretty risky move with how easily Windows will overwrite your boot loader. I usually recommend you pick one os or the other rather than dual boot, so I’m in favor of WSL or virtualbox. Personally, I have never cared for needing to reboot just to switch operating systems. I tend to stick with one and the second one does nothing but take up disk partition space.
WSL lets you run both simultaneously without rebooting. Virtualbox lets you do the same with extra setup. Virtualbox makes it easier to do GUI setups than WSL does, and the network configuration is a little more obvious.
The best option is to get a second machine so you can run both. If that’s not an option, virtualbox is the better choice for learning. If you just want a Linux environment on your existing setup (similar to using a Mac) then WSL is usually good enough
They used to say “one carry-on and one personal item” (which included things like a purse or a backpack). On my shorter trips, I could travel without checking a bag under this policy.