People with smartphones: Do you close out of your apps after using them (swipe up and out of them) or leave them running in the background?

Just wondering what others do. Like after you use an app, do you swipe up and close it out? Or do you just swipe it away/go to the main screen and leave it running in the background?
Keep them running
Close them out
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I’m surprised by how many people close them because that actually takes more of the battery life
People with smartphones: Do you close out of your apps after using them (swipe up and out of them) or leave them running in the background?
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