Which way does excel calculate?

Hello world. I have a question about which way does excel calculate, or attend its calculations, as they are laid out on the sheet. I am asking because I am trying to properly organize a lot of interconnected formulas as best as I can.

Does it calculate the rows first and if so, does it go on row one from column A to the right, and then onto row two? Or does it do the columns first and then goes through each one of the row in that column in ascending order?

What happens if one of the formula results calculated affects something on another part of the sheet? Does it go back and recalculate the whole thing? Or does it go through the entire sheet first and then recalculated?

And lastly, how are multiple sheets involved in this sequence of events? Which sheet gets calculated first and is it based on the sheet code or sheet name or any other specific markers that would render it ahead of something else?

Any help is appreciated, and I hope you have a good day.