Google Classroom is Google's "streamlined, easy-to-use tool that helps teacher and students manage coursework." With Google Classroom teachers can push out and collect digital assignments and assessments, post announcements, and host online discussions. Google Classroom works seamlessly with Google's GSuite applications: Docs, Slides, Sheets, Forms, etc.
In our district Google Classroom is used in grades 3-12.
Start with an EdTech Teacher Leader in your building or ask a colleague.
Contact an instructional coach for additional help.
Teacher Center for Google Classroom (Excellent getting started resources from Google)
Best Practices with Google Classroom (updated every summer)
Overview of Guardian Email Summaries (Google support page)