I lately got into learning reactive programming, especailly RxJS, and in this post, I will be listing resources I found very insightful for beginners.
First off, you can start by reading the very good primer which is avaiable on Learn RxJS. Follow this link:
RxJs Primer
I would then recommend you read The introduction to Reactive Programming you’ve been missing:
Intro to reactive programming
Once you’ve got a glimpse of how you can use observables and how operators work, you can use either of the two visualizing tools, Rx Marbles or Rx Visualizer to deepen your understanding of some of the operators you have just seen, or to check others !
Also, it is always a good practice to get your eyes on the official documentation from time to time and read through it to further deepen your understanding of the concepts once you have had a simpler introduction:
Official documentation
Do not worry, this is not the end of this post, for I will keep updating it as I advance in my research and my learnings !