Laptop memory, also known as “RAM”, is how much stuff your laptop can run at once. Every program you run uses memory, and how much depends on each program and how you use that program. If you’re using a web browser but you have 50 tabs open, that might consume a whole lot of memory as opposed to having 2 or 3 tabs. The kind of content you load in each of those tabs also determines how much memory is consumed. For instance, a single webpage could consume anywhere from 10MB to 500MB of memory. If you keep a lot of tabs open that can add up quickly.
Up to 4GB - This is the low end for laptop memory. In these days, 4GB is easy to fill up even with the most basic tasks like simple web browsing. Anything below 4GB is quite impossible to use.
6GB to 12GB - The mid-range for laptop memory is 6GB to 12GB. This is sufficient for most tasks for school work, office work, and every day home use. Unless you work with photo/video editing or some other creative endeavor, the mid-range RAM is great.
16GB or more - The high range for laptop memory is 16GB or more. If you’re gaming, photo/video editing, programming, game developing, or using any other high demand production software, you want to hit at least 16GB, preferably 32GB of memory.