What is an asset class? This is the classification or grouping of financial securities which we can trade. Examples of asset classes are stocks , fixed income, commodities futures and so on.
An example of a stock is AAPL (Apple). AAPL is know as the stock ticker.
An example of a commodity is crude oil, Gold , pork belly etc.
An example of fixed income (bond) is the german bund 10-YR bond.
Knowing this is not enough to trade but it is a simple example.