Marketing is the science that helps my products or services find the right customer. Like any science, it requires knowledge, experimentation, and a clear objective.
These 7 channels are generic and can apply to any marketing effort.
At the same time, I always have to remember that the more accessible a tool is (e.g. social media), the more certain it is that my competitors will also use it.
This is why I need to study the question in depth and understand my strengths and weaknesses before embarking on a business venture without having the basics in place.