No problem! Thanks for your work. I also use OSMAnd and enjoy hiking and mapping. I'm not that experienced either but feel free to reach out if you have questions.
https://www.openstreetmap.org/help and
https://wiki.openstreetmap.org/wiki/Get_help have some links for starting out and where to find help also.

For this changeset, a good comment could have been something like "additions/updates near Lewis and Clark Interpretive Center" or similar. Just something so other mappers (and yourself later on) can tell from the changeset comment what you have done.