Things I've learned:

Visible light communication is a thing - and it predates radio.
Banks can destroy my will.
Talk to your suppliers about packaging, and don't let them ship stuff to you individually bagged.
Industrial quality framed solder stencils are intense.
70% OEE is something to brag about.

Things I'm working on:

Saying no to more things.
It's not that EAGLE Cad doesn't have features; they're just a PITA to learn.
Being really clear about my domain expertise - and monetizing it as such.
Keeping actual finances, as opposed to just spending money and hoping it works out.

Things I'm not really working on:

Exercise. It's been last on my list for a while now, and I'm beginning to accept that that'll be the case until The Public Radio gets further along.
Taking time off. I've spent a *lot* of my ostensibly "free" time working over the past months, and I'm not making much effort to change that - at the moment.