https://screenrant.com/star-trek-discovery-tilly-exit-problem/ [contains spoilers for Season 4]
https://screenrant.com/star-trek-discovery-janeway-ship-retired-story-hints/
and, finally, another source for keeping up with individual episodes:
https://www.space.com/sta-trek-discovery-season-4-episode-5-recap
Abycats' Thoughts 