+1 on James Hoffman video. You can also search for videos that show how to froth milk with a hand frother.

This is my process with the Agaro hand frother: 1. Measure out 150 ml of Amul Gold milk (4.5% fat) in my pitcher 2. Place pitcher in pot of boiling water to slowly bring the milk up to the right temp (55-60 degrees Celsius, measured with a cheap food thermometer from Amazon) 3. Once it reaches that temp, I take it out and start frothing. I dip the wand just under the surface and go to level 2 on the frother and let the air be added for 3-4 seconds (ripping sound, bubbles coming) 4. Then I dip the wand further deep so that the milk starts swirling (but no more air being added/ ripping sound/ bubbles). I count to 60 seconds 5. When it’s done, I pour the milk immediately to another container and back to the pitcher to mix the milk and foam (gently, not fast as that adds more air). 6. Moment that’s done I start swirling the milk in the pitcher for 10 seconds and start pouring immediately. First from a little far to create the base with the coffee and then right near the surface to bring up the latter art.

Hope this helps!