for heavy or items that will risk leverage, shield anchors such as
https://www.screwfix.com/p/easyfix-...vHuAQzO1CtlQBhWFrF0aAqWcEALw_wcB&gclsrc=aw.ds
for plasterboard, hollow wall anchors.
https://www.screwfix.com/p/rawlplug-hollow-wall-anchors-m6-x-52mm-20-pack/68410
The only problem with hollow wall anchors is that they are not removable easily, but they are really good at what they do. No good fixings are easy to remove really when your talking plasterboard.
Source, I used to work with a guy whos job it was to spec specialised fixings to the trade and these were the first go to as gold standard (not the make but the type, he would always say fisher were the best brand)
I also use frame / hammer fixings for heavy items where I prefer to take the pivot point further back as they are longer. So if you have surface damage (or suspect) to plasterboard take it further back, no fixing is stronger than its contact point with the plasterboard, if thats damaged and you connect to it, thats your weak point.
The worst fixings are the screw in things linked above. They make a massive hole, dont really sit flush and you have to be ultra precise or you end up damaging the board (see above comment in regards fixing vs board)
There are actually some fairly good wall plugs now that pull up behind the board in a similar way to hollow wall anchors, the benefit being they are more multi purpose, ie they act in different ways depending what material they are used in
If you can go into something solid behind plasterboard its always without fail better to do so. Plasterboard is easily damaged by impact either directly or indirectly eg by over levering a TV wall mount, or bashing into it.