Also on your (up to date) charts you may fine an anchor symbol in some obvious locations. It pretty much depends on what's around the anchorage and the bottom conditions.
The biggest indicator is when you see other boats anchored. If there are buoys, it may be restricted but not likely.
The biggest problem is swing and set. You don't want to hit anyone/thing or end up on the hard. Be aware, before anchoring, of tidal changes, currents and wind changes................................._/)