Personally I would say start with Arch and if you like it use endeavorOS. Endeavor is just easy install for arch(and the only one I’ve tried that actually achieved it well) so if you already know the inner workings it saves a lot of tedious install work and has some nice QOL defaults already set like yay colorized

Lenovo has official support for Ubuntu on all laptops which translates very well to other distros. IMO the Thinkbook gen 6 having fully upgradable ram and decent specs is a really good deal for a Linux laptop *when on sale