I'll try to summarize it:

• Plan: your week as time blocks, repeating or one-off. You can skip or move a single occurrence and save week templates. External calendars show next to it, and there's an ICS feed out.
• Board / Todos: today as a kanban board, plus undated todos with tags, filters, attributes and links. Putting a todo on a day schedules it.
• Weekly review: clear out stale todos and write a note on the week.
• Notebooks: notes per subject in folders, a diary, ideas, people (birthdays, relationships, every mention of them). Those work as scopes, they can hold everything mentioned here: goals, workouts, inventory, tasks, etc.
• Goals: numeric targets and progress logs. You can link tasks to a goal, so finishing them moves it.
• Health: habit tracking with a heatmap, and workouts that log reps, kg and km per exercise. You can put those on a date too, log how much weight you lifted, the distance you ran, etc.
• Inventory / Shopping: things you own with quantities and restocking. Recipes use inventory items as ingredients, and what's missing goes to the shopping list, which you can open offline in the market to see what is missing.
• Finance: ledgers, statement import, auto-sorting rules, bills. Also integrates with inventory prices.
• Media: a gallery and audio recordings. You can put those on notes and tasks, or standalone.
• Reminders: on blocks and todos. You get notifications on the mobile app or PC.

There are also the integrations I mentioned; the thing about it is that It's keyboard-driven (vim-style keys) too, and you can run it in the phone fully isolated (never sees the internet).