Sometimes we do not listen to the words of a song and somewhat unclear and it is very fast. How to deal with such a problem? What can be done to catch that words while singing? What are the tips and solutions?

Here is a video explaining how to slow down (or speed up) a video on YouTube: https://www.youtube.com/watch?v=HLoMchpqhnA. I also recommend you look at the lyrics as you're listening. I use AZLyrics or Genius!