First of all you need to know about who Daredevil is and from where he came and what are his qualities, for which you need to watch the previous 3 seasons.
Jessica Jones was one of the important characters of Defenders, Watch Jessica Jones to know about the character recap.
Luke Cage was one of the important characters of Marvel Comics who helped Matt Murdrock with the kingpin issue.
Iron Fist was the lowest rated Defenders member but contained the best strength in his hands.
The team Of defenders which includes Daredevil, Jessica, Luke Cage and Iron fist, together they form defenders who battled the Hand’s deadliest teams.
The Punisher, one of the best assassins who has a great rivalry with Daredevil will also appear in Daredevil: Born Again.
Daredevil appeared in She Hulk: Attorney At Law to help Jennifer Walter with a mysterious case.