I have a Longer Ray5 10W laser. It does not have limit switches. What effect will pressing the Home button do.?
It will go to one of the corners and crash into the rails.
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Try searching for this topic here in the forum, it was just up here and ended up investing in endstops which are relatively easy to retrofit, cheap and the (only 
) serious solution.
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Usually homing function should be disabled then and nothing happens if you click that button. As long as you don’t have limit switches, just don’t click the button
It’s easy to add them, though: Limit Switches - Diode Laser Wiki
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Already been said, but I also recommend the easy cheap addition of switches. It was a game changer for me. The linked tutorial will get you there, the parts are easy to get and cheap. 10/10 would recommend just doing it and not looking back.
Could you be more specific … What are “end stops”? My laser has corner “bumpers”. Is that what you mean?
These are small switches that are mounted such that the mechanics activate the switches before the mechanical limit is reached.
Usually, they look like this or similar:
How do these differ from limit switches? What are they connected to (electrically) so as to tell the controller that the rail is at its limit?
There is no difference. Some people call them limit switches, some call them end stops. It’s all the same. And all are wired the same. If you have two switches on the same axis, they are both wired in parallel. The laser can’t recognize which one has been activated, but that doesn’t matter anyway.
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