The Must Read section contains articles that your Administrator set as must-read.

When you log in to the knowledgebase, you may receive a notification about articles that you must read. You can read them immediately, or read later. If you decide to read them later, you can always find the articles in the Must Read section.

Here you can filter articles by their status, or sort by date when they were set as must-read.
To sort by date, click the name of the Date added column.

The Read column shows if you have already confirmed that you read the article or not.