I like this video for showing exposure basics:I have been practicing some this week but still have a long way to go to understand the exposure triangle.
https://www.youtube.com/watch?v=F8T94sdiNjc
and this article gets shared around here a lot too:
Camera Exposure: Aperture, ISO & Shutter Speed
There are other good tutorials on that site too.
If you still have some camera shake after trying different holds, you might have to settle for a slightly higher shutter speed in some situations.