After watching videos or reading about wind/mirage you still need to practice. Lots of practice. That does not mean shooting, but practice reading wind.
Get a wind meter and a spotting scope. Go out in the field, use the meter to read the wind, then check the scope, looking at mirage, wind in the trees, blowing grass. etc. etc.
After a bit, use the spotting scope first and make an estimate of the wind speeds watching the indicators mentioned above. Check you estimates with the wind meter.
Stick the wind meter in your pocket, as you walk around on your daily activities, look at flags, look at trees, grass, blowing dust, anything moving because of wind. Make a guess and pull you wind meter out of your pocket and compare you estimation to the wind meter.
It doesn't cost a thing, assuming you have a spotting scope and wind meter. The wind meter doesn't have to be a high priced gismo that comes with everything. You're just learning to read wind.
Like anything else, the more practice the better you'll be.
But you're not spending a fortune on ammo. Eventually you'll have to apply what you learned in shooting, but you can learn a lot with firing a round.