Tell Glade what you want to learn, in one sentence, and it makes an editable goal with a useful next step — you do not have to fill in anything else. Glade then keeps a rolling plan: it prepares the next session in detail (objective, materials, an explanation, practice, a check and a stopping point) and keeps later steps light.
If you only have ten minutes, press I have less time and Glade gives you a short version of today's session without changing your plan. You can pause a goal (its reminders stop and Glade keeps a note for when you come back) and restart it later with a small recheck — you never get a second copy of the same goal.
A one-off question ("why do leaves change colour?") gets a quick answer and creates no goal and no schedule.
A "course" in Glade is simply a goal with a plan. Glade can also propose one when you have saved three or more things on the same topic.