There are many beliefs about when the Rapture will occur but the three mains ones are
1/ Pre-tribulation
2/ Mid-tribulation
3/ Post-tribulation
I have always believed in the pre-trib position. I think it is correct. Naturally, I have studied the other positions but cannot agree with them. Anyone living for God, of course, is going to be prepared either way because he doesn’t choose his lifestyle according to his eschatological belief but he lives always for God simply because he loves God and wants to please Him. We must always be ready to meet the Lord. Nothing beyond the present moment is ever promised us.
I preached a message on the pre-trib position of the Rapture a couple of years ago (8.12.18) that I am going to share here. I wish the audio-visual was a little better. In fact, I wish the delivery was a LOT better! But, perhaps, there is some doctrinal content that will be helpful to someone.