Yes, that is what I mean. You have a max and min travel limit (also referenced as + and -).
It is always good to have these in place. Of course Lightburn will take machine size into account when defining machine limits so you should never hit them. There is a catch though. For instance if the machine loses steps it could be that you bump into a mechanical limit and might damage something.
The limit switches prevent that as an extra safety - a hardware limit before actually hitting the machine hardware limit. This also means that you should not mount them on the exact hardware limit, but a little before that. Keep some slack.
Better safe than sorry