This is a chart showing some members of the wasp and bee family. Notice the wasps usually have a very thin piece connecting the thorax with the abdomen. Wasps in the US also don't have many hairs, or they are hard to see. Bees tend to be more fuzzy.
Below is a honey bee. Notice somewhat furry body, with golden, not quite yellow, stripes on abdomen. Also look for the pollen baskets on its legs.
Below: unknown wasp, possibly a hornet.
Steel Blue Cricket Killer/Hunter. Not the same as a blue mud dauber wasp. Not aggressive. Fun to watch as they are a bit spastic when they are hunting on the ground.
Ichneumon wasps come on a HUGE variety of sizes. Including ovipositor, they go from .25 inches to 6 inches (Megarhyssa). They do not have stingers. What's the point with the ovipositor in the way? Not aggressive, and helpful. If you see a wasp with a noticeable pointy thing at its hind end, it's an ovipositor, not a stinger.
An ichneumon Megarhyssa trying to lay eggs in dead bark. Length of body: 3", length of ovipositor: 3". When flying they are loud like a model airplane with a plastic propeller, but they are not aggressive, they are pretty calm. They also come in a chocolate brown with yellow stripes.
Below is a clearwing moth, which is neither a bee or wasp. These often move about in a darting motion like a hummingbird, and they also feed on nectar.
Another type of clearwing moth. Notice how it tries to mimic the aggressive yellow jacket wasp.