How to read this list
Each line is one repository, in the position GitHub gave it. The number in the circle is that position. The green figure on the right is the number of stars GitHub says the repository gained today, and the percentage under it compares that gain with the stars the repository already had. A project that jumps from 300 to 900 stars and one that goes from 90,000 to 90,600 both gained 600; the percentage is what tells them apart.
The title opens a page for the repository with its description, the first paragraph of its README, license, dates and, when the README has one, the command to install it. Details shows the same facts without leaving the list.
What “trending” does and does not tell you
A place on this list means many people starred the repository in a short time. It says nothing about whether the code is maintained, documented or safe to run. Launch-day attention, a popular post or a well-known author can put a project here before it has a single release. Before depending on something you found here, look at the last push date, the open issues and the license.
GitHub does not explain how it orders the page, and the order is not simply “most new stars first”: you can check that in the list above by sorting it by Stars gained and comparing with GitHub order.
Other ways to look at the same data
The weekly and monthly lists smooth out one-day spikes. Fastest growing reorders today’s repositories by relative growth, which favours small projects on the rise. The archive keeps the list of each past day, and How it works explains where every number comes from.