..."North Bank Park"? I've never heard of it, and as far as I can tell, neither has the Parks Department.

Are you sure Crestline between 11th and 15th doesn't exist? Aerial imagery certainly shows something street-like.

Not just satellite imagery. I've got a half-dozen photographs of it at various times this year.

At least one of these still existed in October -- at least in the form of a sign on a store. I didn't check to see if it was still open for business, as I was navigating a busy parking lot at the time.

The tag would be either Music Store ("shop=music", for a store that sells CDs, vinyl records, etc.), or Music Instrument Store ("shop=musical_instrument", for a store that sells instruments and related things). I don't know if the Maps.Me editor has presets for these, but the iD editor on the OpenStreetMap site does.

Since you're using the iD editor, you can split a road into two parts by clicking on the road, then shift-clicking on the dot at the appropriate place to split the road (if there isn't one, you can drag the nearest triangle icon on the road to create one). Then, click the "scissors" icon on the menu that appears or hit the "x" key. You can now adjust the parts of the road independently.

The "name" field should only be used for the name of the object, and nothing else -- computers don't understand that a suffix of "(Closed)" means that a gas station is closed, and so it will still show up in searches.

The customary way to indicate that a business has been closed is to stick the "disused:" prefix on the tags that no longer apply. For example, this gas station would be "disued:amenity=fuel", "disused:fuel:diesel=yes", and if the name has been removed from the signs, "disused:name=Conoco".

Did you mis-type the tags for the signals here?

When mapping businesses, it's useful to indicate what sort of business it is, to make it easier to find. For example, "Roger's Towing & Recovery", in addition to being a building, is probably also a "car repair shop" (tag "shop", value "car_repair").

Thanks for adding speed limits -- it's nice to know I'm not the only one who cares about them.

Is there a reason why you placed two wastebaskets in apparently-random parts of Area 51?

"shop=cannabis" is the more-common way of tagging marijuana stores (120+ uses versus 12). I've gone ahead and changed it.

You're not allowed to use Google Maps as a source for mapping. The data isn't under an open license, and Google could react in legally unpleasant ways to people copying it.

The more information you can provide about something, the easier it is for people to find it. For example, in addition to marking the building as being a commercial building, you could tag it as a bank, and indicate that it's got an ATM (or not).

Two issues with this edit:

1) "Simple changes" isn't a very descriptive comment. If I'm reading the changes correctly, a more accurate comment would be something like "added points of interest".

2) Elevations in OSM are measured in meters, not feet. Your change to the summit of "Colonel Bob" makes it one of the tallest mountains in the state.

Is there a reason why you don't want 13th/Rosamond/West/Westcliff/Deska classified as tertiary? The route has an elevated speed limit, right-of-way over intersecting minor roads, and is classified by the city as an arterial -- all indications that it should be tagged as "tertiary".

Where are you getting the name "Grand Junction" and the presence of a stop sign on a railroad from?

Is this a fire station? Fire stations have their own building type, so they can be indicated as such with an appropriate icon or other marking.

The "name" field should only be used for names, not descriptions. Most parking lots don't have names.

Buildings should not be placed inside other buildings -- it makes it hard for map renderers to draw things correctly. The preferred way to map a building containing multiple businesses is to draw the outline as a generic building, then add a "point" feature for each business.