Not an eye opener for me as I'm not a business owner, but many of the strategies are similar to those my husband and I used before we married. I made less, but we owned the house together. His cousin is an accountant and suggested that I take the standard deduction while he itemized and claimed the full mortgage interest deduction. There are a few other things like that, that work well if there is income inequality for a couple. As a married couple, I have the dependent care account deductions taken from my paycheck because they're taken out before Social Security and he hits the SS cap, so there would be less ($100?) tax savings. Caveat: It decreases my earning from the Social Security Administration's perspective and if we divorced it would make things less comfortable for me in old age. We're both happy, so we do it.
Another trick/tip, recommended by our financial advisor: donation of appreciated stock rather than cash. The charity of your choice gets the same dollar amount you were planning to donate, you avoid the capital gains tax. Works best if you are a regular/generous donor.