Enderal isn't Skyrim. most "important" quests do have markers, or a least clear instructions;
"Myths and Legends" and "Lost hearts" are more or less...quests, which will run on the side
Biggest Egghunt Ever
read your journal - you should have descriptions about the other places.
(check the names of the myriad towers.) there are no questmarkers.
Myths and Legends
there are books about those, read them

(you'll still have to search a good deal) (here be
spoilers, if you really want them)
there are no questmarkers.
Lost hearts
yeah, this one is pure luck.
here be
spoilers,if you really want them
(including the solutions, beware)there are no questmarkers.
Fragments of the Past
hm.
as you said, you are on your way to Jespar.
so right now, you know what you're supposed to do.
and you will continue to know in the future
hope that helps a bit
