https://www.thesprucecrafts.com/know-your-furniture-leg-styles-4053726
I wish there was a book that I could recommend but some are more complicated than they need to be !! Just look at the basics first !! The link at top gives a pretty good description of basic leg styles !! Once you are familiar with those then move on to another area !! Foot styles would be next on my list,, then just put the two together to determine approx age of most items !! Keep in mind there are no hard and fast rules about furniture so you have to judge with an open mind !!
Most of what you and I will see will be reproductions !! Not modern ones but they have been re-making older styles for the last hundred years or so !! Occasionally with some changes for the common era !! You can always ask questions here if needed !! I try to be here at least once daily !!
Many of the styles were used in the UK well before they got to America !! So we study the same styles,,yours is just a bit earlier than ours !!
