We have a base amount that we give, that is consistent-to-growing each year. We may also give more in a given year with large positive surprises for us.
We have a number of researched charities that we give to. How much we give to each varies somewhat, because we include DS in our giving. We make it part of our Thanksgiving festivities. (Next Thursday, in the US) We have a 3-part bank for him: spend, save, and share. He gets to use his Share savings in our "giving game" each year. We place dollar bills on a game board, that is just a grid of the charities. When we place the dollars, we either talk about why we are supporting them, or just something we are thankful for. He knows we match his donations, but the reality is that each $1 is really $100 donated.
Since we paid off the house, we use the standard tax deduction, so there isn't really any tax driver each year. We have talked about a DAF, but won't likely do it this year.
Having said this, we did go out of process this year, and made large donations to World Central Kitchen and Care.org at the beginning of the Russian invasion of Ukraine. They both are part of the regular game, too, so will likely get more now,
I worked for a global megacorp, and we are well-travelled globally, so my giving tends to range quite far. My wife is hyper-local; she wants to know the people she is supporting, and even better if we are volunteering there, too. We also are strong believers in education, and support the nonprofit schools we have attended, from my son's elementary school in Dublin to our Universities.