Don't. Same advice I give to all semi-serious folks who are just looking for something to get by. If you buy one M18 Fuel in something you use often, that starts you down a road there is no coming back from.
My neighbor/packaging guy is a retired carpenter. He sold off all his air stuff and big corded electric tools when he retired. He picked up a homeowner special Porter Cable 20 volt set up. It is at the lower end of okay for homeowner shit and he was kinda okay with it since he didn't use it much. He watched me using my Milwaukee stuff, he knows tools and was impressed. Asked me should he buy some and I told him the same. Don't start down that road. He ignored me. Now he has almost as many as I do and quite a few I don't. He likes lights and yard tools. I need a few lights and I hate yard work.