Trying to stop blender from lagging

I’m creating a pretty large scene and I’m pretty new to blender. So I’ve noticed that it began lagging with all the additional objects I was creating. I started with making an additional scene and dividing the models versus the scene itself which kind of helped but I feel like there’s a better way I was trying to understand the use of assets. If anyone can explain the use. Is it storing on my computer, is it only for the current project and is there a better way to stop it from lagging. (I am using geometry nodes as well to create meadows and trees. If that makes any differences with how to approach it)