I am currently struggling on seeing where exactly conformational isomers fit within stereochemistry & how (and whether) they are a subset of diasteromers. I've seen potentially conflicting information online on the definition of diasteromers (some sources mention that diasteromers are not mirror images of each other and not superimposable, while others don't explicitly mention the superimposable part).
I am convinced that enantiomers and geometric (cis-trans) isomers are a type of configurational isomer, the latter a subset of diasteromers (I hope this is correct), since they require bonds to break in order be superimposed with each other. However, due to some online sources differing in their mentioning of the superimposability requirement of diasteromers, I'm not sure whether diasteromers are a subset of configurational isomers (if this is the case, then it would seem incorrect to place conformational isomers within diasteromers, since it itself is a subset of configurational isomers).
For more of a visual explanation, see the below flowcharts:
(a) First flowchart; conformational isomers / conformers within diasteromers category. Doesn't mention configurational isomers & where they fit in.
(c) This flowchart separates configurational and conformational isomers and places diasteromers under configurational isomers. I feel that this third flowchart most closely resembles how I would personally organize all of the isomers (the only thing I'm unsure about is the mention of optical isomers, which I assume is a quality all non-cis-trans/geometric isomers exhibit).
Any help on this would be greatly appreciated! Thank you so much :)