Here's a short list of course-related tools I recommend based on personal experience.
Affiliate disclosure: I may receive a small commission if you make a purchase via these links.
These are platforms for hosting your online course content, and maybe your entire business.
Email marketing tools help you build a list of subscribers and send emails to them at scale.
Analytics tools help you understand where your website traffic is coming from.
Here are some other tools I use on a regular basis and recommend to other course creators.