Sentences - "lag behind" and "miss out"

This is a perfect example of the phrase "lagging behind." You could also say:

"By the time she reached the fourth mile, the runner was lagging behind her friends"

"When Maria left the shop, James lagged behind to look at the discounted items."

"The teacher was always reminding the students not to lag behind after recess."

Make sure you don't miss any information out, because you should put all your personal information.

This is not the correct use of "miss out." I would say that to "miss out" means to be unable to participate in something you wanted to be a part of. So for example:

"I missed out on the sale because I was visiting my grandmother."

"She is always checking her phone so that she doesn't miss out on any events." 

A common idiomatic expression in English is "Fear of Missing Out" (#FOMO). It refers to someone who is always worried about missing social events. It's often used as a joke on twitter, like "Too many parties, not enough time. #fomo"

Can someone give me more examples, please? Thank you.