Is there any rule of thumb on how much or how less I should put a UI content on a screen?

1. What is the rule of thumb for organizing content within an interface?
2. What is the rule of thumb in design?

What is the rule of thumb for organizing content within an interface?

The rule of thumb here is that if an element is more important than another, it should be of a higher visual weight. This makes it easy for a user to quickly skim the page and distinguish between the important and less important information.

What is the rule of thumb in design?

Design Heuristics (Rule of Thumb)

It specifically involves evaluators examining the interface and judging its compliance with recognized usability principles (the “heuristics”). Before starting the designing process we need to follow a few rules to achieve a perfect system.