Closing recent apps?

Hi.

Probably a dumb question especially as I should know this after doing a IT course but is closing apps from the recent apps list a badish thing?
WIth windows I'm used to closing apps to free up RAM for other programs but I've recently found out that android doesn't work like this and it's best to keep the apps in the recents list for faster loading etc. While this makes sense and I have obviously noticed that apps will load faster if they're in the recent apps list but does this not have an effect on cpu or battery life?

Just need some clarification as how how android manages it's RAM compared to windows and whether it has a negative effect on performance if you leave apps in the recents list.

app keeps force closing

i just had installed the app from the play store and the app kept force closing with no apparent reason so i was forced to uninstall it. Pls help me, i am using a moto g 2nd gen with lollipop 5.0.2 on it and it isn't rooted

Ram usage when closing all apps

For me 1.3 gb to 1.4 gb