Moodle is an excellent and free LMS that strikes a great balance between simplicity and flexiblity as well as providing many essential tools and features needed for K-12 teachers such as course creation, student management, grading, etc. The goals of this guide is to teach TEACHERS how set up their own course using an LMS so they can start teaching.
Check out my online guide on how you can get started with your very own remote teaching and learning set up. Although it's designed for teachers who work with K-12 students, that isn't to say that adult learners can't benefit from reading through this guide as well.
Zoom has proven to be a simple and user friendly application that just simply works. Although it comes with a 40min limitation for free users in a single continuous video call, that's still enough to get through most online lessons anyways. There's no limit to the number of times you can connect so with a little work around, there's actually no downside to using this app for a lesson. One of Zoom's best new feature is breakout rooms which allows for private group work.
Google Drive is probably one of the most, if not the most, important tool for reading and writing. All of the necessary apps and tools for reading, listening, writing, editing, collaborating, and presentations can be done thanks to Google's free online storage and free access to powerful web applications. Give it a try!