The crossword solution for the term 'MAIN DIRECTION' is APORT, which is an acronym for 'Applied Portfolio Theory'. Applied Portfolio Theory is a method of investing that seeks to maximize returns while minimizing risk. It is based on the idea that diversification is key to successful investing, and it involves creating a portfolio of investments that are not correlated with each other. This helps to reduce the overall risk of the portfolio, while still allowing for potential gains.