For example, what do the numbers in brackets in “Elements 0.7.8 (23502)” mean?
I ask this because the next version Elements 0.7.9 (23506) has moved 4 places but there are only two things listed as having changed.
Does it mean that 4 things have been changed but only two are worth mentioning?
Cheers.
My understanding is that it is a Build Number. A build is a process that brings together all the different parts of a software application (e.g. compiles high-level languages into executable code) into a single installable product ready to be distributed to users. Several builds may be performed before that version is ready to release and each will have a different build number. The higher the number, the more recent the build. Happy to be corrected if I’m wrong 
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I do a litle app development and every time you release a build to the Apple app store, possibly for other internal testers to download etc., you can keep the version the same (0.7.8) but you have to increase the build number. So if you release a build to testers, they find a bug, you fix it, increase the build number and release it again to the testers.