Channels: Order of new content
You can choose whether new content appears at the back or front of a Channel. (You can always re-order it later.)
When creating or editing a channel you can choose whether you want new content to appear at the back of the Channel or the front of the Channel.
If you are creating a structured learning pathway, then perhaps it would be more beneficial to add content to the back of the Channel.
If you have a Channel for company updates, for example, then it might be more useful to select 'front of the Channel', so that new updates appear on the front of the page, and older more outdated news gets pushed back.
Remember that you can re-order the contents of a Channel at any time!