Downshifting to 2nd or 1st while moving (technique)

ESPdrunx

Thanks for the response. So when rolling up hill in second and traffic becomes too slow for second (but never stops), the appropriate way to keep from stalling is by rev matching into first? I usually face this issue when going up a ramp to a freeway with a quick red/green light. coming to a complete stop and shifting into first is not always an option wit cali drivers behind me (sorry to the op for thread jacking lol).