Since nobody has done so, I'll link the investopedia article: https://www.investopedia.com/terms/o/option.asp

Regardless, the best advice is to not trade options. Options are designed to hedge against big price movements. You could sell options, but you probably do not have the capital to make a living off doing so, which means you should follow the optimal strategy for most people. You should buy a low cost total stock market etf or index fund, like VTI.