I am not a financial expert, I've never attended a stock market course either. I graduated as a software engineer, that means that I've never received any financial education. The entire content of OptionsRules is based on my own experience as the result of over 8 years of hard work. I learned everything I know on my own.
Trading support and resistance levels can be an extremely simple and useful tool to have as a trader, not just for forex but across a whole range of assets. It is one of the most widely used concepts in trading.
In the world of options there are two types of probabilities. One of them may be used easier when selling an option, the other may be when buyin an option. This information may be useful even if you will never trade option!