How do I properly leave a job?

I (27f) have only had 4 jobs in my life since 16. I’ve been a cashier in high school, waitress, seasonal zoo attendant and a seamstress. I have only willingly left my cashier position in high school. I left my waitress job due to being put on bed rest while I was pregnant. The zoo position seems self explanatory. I applied to a few odd and end jobs and now have an interview that has starting pay more than what I make now. I love my job, but money talks. I want to be able to come back if this new possible job doesn’t work out. What are some things I can do to make sure that door stays open and I can keep the possibility of coming back?