Udemy
The ASL course on Udemy is a video-based course conducted by a teacher that covers all of the fundamentals for any novice, such as the alphabet, numbers, colors, family, and emotions. It also contains a history of ASL's development, which provides a fascinating background on the language that is frequently left out of other courses.
The course also includes a Q&A part for each video, as well as a downloadable workbook to review what you've seen, making it fairly comprehensive and allowing you to ask questions if you get lost. Rather than merely showing you how to mimic the signs, as some other courses do, this course explains how they're made, breaking them down into the motions and how to position your hands. It also goes beyond just picking up individual words or phrases to teaching how to utilize each sign in whole sentences and discussions.
Total viewing time for the course videos is 2.5 hours (not including your own study time). At full price, it's $49.99, although it's usually on sale for $13.99.
Website: https://www.udemy.com/
Reasons to buy:
+Includes a brief introduction to the history of ASL
+Breaks down each sign clearly
+Q+A section useful if you get stuck