If someone taught you that you needed to stop 3 seconds at a stop sign and charged you money, you may consider asking for your money back…
I have worked with dozens of students who went to another school and paid money to learn this, but they only remembered to count “1,2,3”, without even stopping (this will fail the whole P test)!
Here is the simple way to handle the “stop” sign — simply STOP (completely), right before the solid line. No more, no less.
More info from the “Road Users Handbook” as per the pic attached, you may download the whole rule book for free from this link: https://www.rms.nsw.gov.au/documents/roads/licence/road_users_handbook-english.pdf