Online Spanish 1 textbook, free to use

In the spirit of doing my part to help education be a public good, and as low cost as possible, I've created a Spanish 1 textbook online that is free to use. If you'd like to suggest any updates to it, feel free to message me and I'll either discuss it with you or update the site as soon as humanly possible! You can find the textbook here: www.spanish1.org