Subscriptions aka the only reason why i check my emails on a daily basis. You can find your subscription list by hovering over your username.
Your Subscriptions page where you can sort by what type of subscription you want to view:
To subscribe to a work, series, or user just go to the top of the corresponding page and press subscribe:
Updates:
Work: New chapter
Series: New chapter or new fic in series
User: Whenever they post a new chapter or a new fic
Whenever there is an update for whatever you’re subscribed to you will get an email with a link to the new chapter as well as all the info about the fic/new chapter. Emails look like this:
Click on the equivalent text to ‘Chapter 12: Ratio’ and you will go to the next chapter. If its an archive members only fic and you aren’t logged into ao3 on the browser it opens in you’re going to have to log in first and then either refresh the page or re-click the link.