Digital Reading and Writing Lessons, as well as digital Vocabulary Quizzes, can be posted to Google Classroom as the last step in the assigning process.
All Writing, Discussion, Grammar, Related Media, and Vocabulary Lessons come in Google doc format. Once you make a copy of the Google doc assignment and adjust the share settings to meet your preferences, you can share the link in Google Classroom or any other learning management system.
Note that Reading Lessons are not available in Google doc format because of agreements with the text publishers. Reading Lessons are available in PDF, however, which you can share with students as you see fit.