this is easy to explain.
shut down = turn off any programs running, and turns off your pc
hibernate = keeps your programs running, including your session of windows,
on the hard drive and turns off pc. usefull for if you will not use your pc
in 1 hour or more*, but don't want to lose where you are in your session.
sleep = keep your programs running including your session in windows in
memory(not hard drive, on ram) and put computer in sleep mode, or also known
as power saving mode. usefull for if you will use your pc in 1 hour or
less*, but don't want to lose where you are in your session.
*if you are connected to a power supply, there is no need to hibernate or
sleep unless you want to, it's mainly made for people who are using their
battery
i suggest keep using shut down in your case, some will contradict me, but i
found that having windows freshly booted is more performant than having
windows after you ran some programs and closed them, but everyone has their
way with it, so it's your choice.