When I don't know what to do, just study in the forum。

In the beginning, I could not do anything, and I could not set tracking. Later, I learned to make pre-landing pages, optimize, and test continuously until I reached my first green, even many green. With the increase of traffic cost, the profit decreased， and green disappeared, now I don't know what to do, without the initial excitement, now I am afraid of failure, afraid of losing money. I know that spending money is collecting data. Although I have had success, I just don't have confidence，When I don't know what to do, just study in the forum。