ISO and ASA are the same thing, a reference to a measure of light sensitivity. It was renamed from American to International Standards. (And I think the O is Organization and the A was Association.)
Learn to hold the camera straight. I looked at your B&W photos taken along a river - just about every one is slanted to the left. (That makes for a good bit of unnecessary extra time and work to have to go in and straighten all of those.) Some of these look like the ground was a slope so it's not as noticeable, but I can see the camera was not being held straight looking at the telephone poles.
You are seeing interesting subjects. Take time to frame them properly. In your enthusiasm you seem to be firing off the shutter without completely seeing what you're looking at.
For example, #5 - the headstones make for an interesting background. Have the ducks in the frame or out, not part way in and chopped off. In one of the other shots, most of the ducks have their heads down, and that's timing - watch and wait for them to bring their heads back up so you don't get mostly boring brown duck butts. In #12 you needed to be to the left of the tree and pole so we can see the birds in flight.
Look at the backgrounds - keep things out of the frame like the tips of branches, etc. The ones with a blue sign in the background needed to be framed differently to keep that sign out of the picture (because that bright blue stands out more than the ducks). Be aware of telephone poles, etc. and move around, change your vantage point, to keep those out of the frame (think about if something should be in the frame and part of the picture or not).
Once we get into longer days maybe you'll be able to spend more time framing shots and looking and won't be so rushed before you lose light. Go for quality rather than quantity - taking 100 on one evening in a short amount of time before the sun goes down is way too many. Take about 10-20, that's plenty.
You should with more practice and time get so you're able to frame shots efficiently. I've done hockey - you can do more in 2-3 seconds than you'd think. I can relate to the excitement (because I've been a photographer forever and still enjoy when I get a good shot and nail it). Just remember to breathe! and think, and see.
