Stopping or not stopping

As long as I approach the red light or brake from the secondary road to the main road, the automatic transmission shifts periodically, slows down the car and brings it to a halt, just in the meantime, it feels like the car gets dark and never stops when I lift my foot from the brake to close that gap. Is this normal? If not, what could be the reason. As someone who has used manual gear cars for many years, it is the first time that I drive automatically and I have concerns whether it is caused by me ...

It is normal. On vehicles with fully automatic gears, it tends to go as long as the foot is not on the brake. Especially if the car is not in LPG but in gas, this will be more obvious.