I'm a fairly newbie so I'll chime in a bit. In short ...
All this stuff can get overwhelming and thus confusing. And I used to shoot film back a long time ago !!
The first mode I would tell you to try is Aperture Priority mode. On a Nikon this is normally "A" on the selector switch, Canon may be different like Av or something.
But the Aperture is a neat learning tool. Take a picture in the lowest aperture and take other pics in the higher apertures. I didn't see much of a difference until I bought a 50mm/1.8 lens. The 1.8 compared to a 11 is very drastic and I finally saw what people were talking about. But just compare the extremes then you will start seeing the difference on each stop.
Also, if you use a image viewer see if it has Properties. For instance, with Microsoft Office Picture Manager, File, Properties, then "More" on Camera properties it list the "Focal length" and "F-Number". You can get this on the camera too in addition to shutter speed.
But the Aperture is interesting to learn about putting foreground and background into focus or not. I found this interesting.
After you get comfortable with understanding how the Aperture affects the "depth of field" focus then
wander into Shutter Priority. Then you can learn about how the shutter speed affects the blurring. Such as blurring of water flow. Getting it sharp in focus versus showing some form of water flow. Take a picture of you shower on a fast shutter speed then start slowing the shutter speed down to get more blur of the water. Or a waterfall, or rocky stream works good too.
After that learn about ISO. This is probably set to AUTO. Learn to turn it OFF so you can manual set it.
If you can look at your previous pictures and see what the ISO setting was.
Basically the sensitivity to light. 100 being less sensitive to light, but good to use in bright light. And 800 being more sensitive to light and better in shadowy areas.
This will give you the basis to move into Manual Mode. If you get confused just go back to Auto or Aperture .... I used to do that all the time.
familiarity and being comfortable in understanding if you make a change in shutter, aperture, ISO and knowing how it will change is key. As you become more comfortable you will be in Manual more. It's taken me a long time but I'm starting to be more comfortable being in manual all the time.
and read anything you can get your hands on. YouTube has some excellent Videos. When I first started looking at YouTube I liked "DigitalRev" and "Jared Polin" stuff. It wasn't hard core and kinda funny