Columns - daily / weekly goals, rows - days. Every morning I fill in the previous day and reflect on the upcoming one.
I've tried a bunch of tools and also develop some of my own, but so far (~20 months) this simple solution has been the most effective and sticky for me.
This seems like the most straightforward, practical approach.
I am really considering building my own tools this time but I really wanted to get a feel of what worked for other people. I don't want to be in a situation where I have already committed to build something and halfway through, I find a simple-enough solution that works well.
But yeah, sheets is a great way to think about, probably the most objective.