find a way to add this resources to google classroom or similar?

[caromelendezl]

In addition to the flex froggy, you can use these games to practice css selectors and grid. https://cssgridgarden.com/ and the other one https://flukeout.github.io/#

[gregdyke]

More generally, resources can be shared directly with trainees in the Slack channel, or a pull request can be made against the syllabus. (If added to coursework in syllabus, we would then also add to google classroom template)