Push a stream of air from your throat through your open mouth. No tongue or lip contact.

Americans pronounce humming as HUH-muhng (/ˈhʌməŋ/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "The refrigerator is making a humming sound that is quite loud".
Record yourself saying "humming" and play it back. The mic stays on your device — nothing's uploaded.
2 syllables, 5 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
The textbook way isn't wrong — it's just not how anyone actually says it.
Stress falls on the first syllable, not the others. Stretch HUH — keep everything else short and quick.
Don't pronounce the first syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.