Github actions are just ways to set up and create some custom workflows for example after you push to a repo, then execute a series of actions such as change your DNS on Cloudflare or send and text message.
Github actions are currently a beta product that is only available to personal accounts at the moment and not teams just yet. With that being said if you do sign up for the beta be mindful of which projects you add this to.
More options after we commit are code is interesting to me. It can allow for some clever things done to our code. That is what makes something like Netlify so special because it always you to run a build command after you push to a git.
Github Actions is still in beta so you might not see this across all of your repos. If you are unsure of how this feature will help. You can start browsing through a list of actions,.