Tasks become real calendar blocks
Your to-do list stops being a list and becomes your day.
A to-do list tells you what to do and never when, so it grows until you stop looking at it. Tell us how long a job takes, when it's due and which hours it's allowed, and it gets a real slot around the meetings you already have. You stop asking "what should I work on" and start asking "what's next".
How to use it
Calendar → Add task (or Tasks → Add task). What needs doing, How long and Priority are all you have to fill in. Due, Not before, When can this happen and Notes are there if you want them. Press Schedule it and the block shows up straight away.
The honest version
Every task needs a duration. That's the one bit of thinking we can't do for you. The inbox is the escape hatch — capture now, guess the length later. A block shorter than about twenty-five minutes is drawn taller than it is, because a five-pixel sliver is not a thing anyone can read or tap; see The day, drawn to scale.