These are some websites that I enjoy using for blue team learning and practice
Letsdefend is a blue team training site with hands on learning involving a simulated SOC and various challenges including incident response, malware analysis, and cloud security
TryHackMe is one of my favorite resources for learning cyber security with in depth reading and hands on learning. Although the free plan is a bit limiting with only having access to free rooms and one hour a day of using their web-based machines for using their labs. With their premium plan you get access to all rooms, and unlimited access to their web-based machines. TryHackMe is primarily a red team based site, however their blue team paths and challenges are still very good.
picoCTF is a fun