Most important learning in Technical Analysis

I have been learning technical analysis since 3 years and making profits and losses in trading.
When I look back to find out what would be my most important learning in TA till now.
I considered various stratergies as learning, but most important learning is to always have alternate structure ready if expected structure goes wrong. You may not plan for expected stratergy, because any way you will be in profits, but alternate analysis/wave structure has to be ready to avoid huge losses. Huge losses happen in panic and Panic always happens if you come across any unexpected things. Nature always surprises us and Stock Market is Nature of trends. It will always show that history repeats, and one of thing it repeats is it always surprises everybody including you. Hence you should be always ready with alternate wave structure/trend assumming that the trend wont go in your favor.