@Amaris_Bane has given you some great information!
I personally have 2 altar setups, also for separate things. One is on my nightstand. I have a space for Brigid & Her items along with passed on loved ones & that includes fur babies.
My main altar has space for the Morrigan & I typically do any crafting or workings there.
Everyone’s altars are going to be different in setup & items.
There is also a thread:
Weekly Witchy CHALLENGE - All About Altars!
My larger altar, where I do most of my workings, a portion of it is pictured here. It’s only a portion, as it’s pretty large compared to my 2nd one & it’s continually changing.
I recently changed some of it again & found out that apparently I collect altar cloths 