Do the work. That's all the productivity advice you need, and the only useful productivity advice you're ever going to get. You can direct your attention to a million optimizations— email, meetings, notes, calendar, time tracking, goals, todo lists, time estimates, prioritization frameworks, quantified self sensors, analytics, apps, documents, journaling. But don't. Ignore all this, and do the work. When you do the work, everything else optimizes itself.
> People do new founders a disservice by constantly proselytizing how complex startups are. In one sense they are. But in another sense they're surprisingly simple.
I think this is often people confusing "hard" for "complex". The right way to think about (most successful) startups is that they are simple, but hard.