This site provides an in-depth discussion of the seven key aspects required for PBL to work correctly in the classroom. I like this site because it breaks down each step, and lets the teacher know exactly what is needed for a successful project.

This site provides a great summary of PBL, as well as informing the teacher why they should use PBL in the classroom. It is very thorough, and it provides external resources.

Edutopia is a great site in general and provides an abundance of valid sources the teacher can use to educate themselves on PBL.

Edudemic covers the latest research, news, and resources for educators. It has in-depth descriptions on new and upcoming technology for teachers to use in their classrooms.

This is a great website for use in a 1:1 classroom environment. Students can visit the website or download the nearpod app on their phone. The website allows them to follow along during the lesson as well as take quizzes, or participate in interactive polling.