a few days ago hot news / updates about ethereum made me and maybe a lot excited, and ETH prices rose markedly after the next day, it kinda showed a little backward or as I thought. Now ETH prices continue to fall! What caused this? Am I missing something?
Yes, you are missing something. Market price action does not equate news, vice versa. People out of fear will sell anything even if its already undervalued. People will buy anything out of greed even if it is already very expensive.
The only constant you should worry about is growth and progress.