It's really easy to read wind.

Step #1 Practice
Step #2 Practice
Step #3 Practice

It takes lots of time on glass, and good glass. I have become decent at spotting for match shooting. It has been many years and many many hours on glass. It's kinda like cooking, you learn little things bit by bit, from different days, different people, different ranges and combine them together, and you can make a decent meal. Reading mirage is just one ingredient. Feel, grass, leaves, dust, splash, wind-flags, target paint missing, etc, etc, etc.

Remember also that 1 good match can equal 20-50 days on your own trying to figure it out. Lots of people happy to help and teach.