There are many different philosophies and approaches to investing, saving for retirement, and other financial tasks. For example, there are some websites that recommend particular stocks. These sites often operate on a subscription model, and their advice may or may not pan out. It may pan out in the short term but not the long term, and there are many different variables that influence how a stock might do.
Before investing any money in anything, it's helpful to get a better idea of the U.S. and global financial system, the broader economy, and key industries that make the economy move. Olin Library has several resources to get you started.