Diablo 2 Resurrected got everyone excited for the game and the good news is that while the release date isn't too far off, you might get a chance to try it out in Alpha first. Here is how to sign up.
Signing up for Diablo 2 Resurrected Alpha test is pretty straightforward. Just go to the game's official website , provide a birth date so you can proceed further and you will be immediately greeted with the option to sign up for the Tech Alpha test.
One thing to keep in mind is that opting-in will also sign you up for a Blizzard newsletter so your mail might get a tad more crowded. When you click the opt-in button, just log into your Blizzard/Battle.net account or create one if you don't have it. Once you're logged in, it's complete and you will have a chance to enter the Alpha test.
Be aware that just under the Tech Alpha button, there is an option to pre-purchase Diablo 2 Resurrected. You can do so but this will not guarantee access to the Alpha test.
From that point on, it's just a waiting game to see if Blizzard will send you the invite so you can join the test. There is currently no start date for it but the devs will notify everyone in a timely manner, otherwise it would run the risk of having too few people know about the session and possibly lower participation.