First let's define it TLDR: It comes out of Too long; did not read (and we find it like tl; dr and tldr;). If you use a Linux distribution, search the web for various errors or explanations. You are also familiar with the "man pages" (from the manual).
These pages provide instructions for use, but very often they contain a lot of details. They are often difficult to understand and lack examples that can help you solve a problem you are facing.
TLDR is another way to read manuals. Instead of showing you a comprehensive guide, with this tool you will only see what is extremely necessary, and with examples please. This way you will be able to focus only on the practical instructions that interest you.
With the TLDR command, on the other hand, the instructions are summarized in a few sentences, as you can see in the image below:
For those who are in a hurry or do not want to read, the TLDR is awesome. It should be noted, however, that for some applications, the instructions are extremely vague.
The TLDR for Git, for example, says almost nothing about how to use it other than checking the version and how Git help pages appear.
These flaws are easily forgiven, however, especially when you avoid Google searches to understand how something works.
If you want to try it, you can find it on the TLDR project website. The page includes installation instructions and information on how you might be able to help the project.