It is very safe to trade with support resistance but when we learn to trade we forget it after learning it or we are not interested in using it. But the use of support and resistance is very important in trading. Many of us run after strategy and forget or ignore the use of support resistance. The market always respects support and resistance or breaks out and moves in an up or downtrend.
I urge new trades to learn to draw support resistance with great care and observe the market to see the results for yourself.
I agree with you, support on the chart becomes the reference for future market movements and resistance provides support for the downward chart. Actually this is a simple technique for traders, the most important thing is for each individual to continue to educate about trading skills so as not to get caught up in determining when support occurs and when resistance occurs.