How do i make a second level?

I know how to make “new levels” but how do you make it to where you can go to the next level without falling into space forever?

Your comment is perfectly understandable while you joined a few hours ago, but it is not very clear.
Could you give me the context and/or a link to the game?

When I’ll understand your meaning, I will be pleased to help you.

edit your level

When your character touches (let’s say, a door), edit the door to where when the character touches it, it will load the next level. Then create the level the door loads, and play. As long as the behaviors are all like that, and the next level is complete, it should not “fall into space forever”.