I find Help to be very useful at times but I agree Clive, it can't compete with web search engines. For example it would never return hits like this one which I discovered in under a minute. I hope you find it helpful.
A folder is the same as the storage folders on your hard drive. In the folder view, you can see the same folder tree as you have in your OS - either Windows File Explorer or the Mac equivalent (Finder?).
An Album is an organizational tool that you can use to group media however you wish, with whatever name you wish, in what order you wish, using whatever criterion you wish. They are similar to keyword tags, in that once you have created the album, you can drag the album label to the media or vice versa, and the media will become part of that Album.
Once you have created an Album and select it, you can change the "sort by" order to Album Order. You can then click and drag the media in the grid to a viewing order that you desire.