I also do various 3 card spreads, such as past - present - future or person 1- what is between them - person 2, etc.
For more in depth readings I use the Secret of the High Priestess spread I got from a book, but I am not sure which book it came from. It is a book on the Thoth.
I also like to do an astrological spread, laid out like:
x x x x
x x x x
x x x x
I get a lot out of it as I can really see patterns and interactions between the cards. Each position is an astrological house which adds more information. My understanding of astrology is rudimentary, but with the basics it still gives me a ton of info. This is a spread that I will often leave out for a while and continue to glean more from.
For quick questions I just cut the deck randomly and read that card.
I love to try new spreads, and I do use others too - but these are my go-to spreads.