why is the word baptism plural, as baptisms in Hebrews 6:2? what are these baptisms?

Hebrews 6:2

SBLGNT βαπτισμῶν ⸀διδαχὴν ἐπιθέσεώς τε χειρῶν, ἀναστάσεώς ⸀τε νεκρῶν καὶ κρίματος αἰωνίου.

YLT of the teaching of baptisms, of laying on also of hands, of rising again also of the dead, and of judgment age-during,

LEB teaching about baptisms and laying on of hands, and resurrection of the dead and eternal judgment.