Though I understood investments in stocks and bonds in theory via various classes in high school and college, I had gotten the impression that is was no different than gambling. Everyone I spoke to was focused on making a large, quick return. In the early 1980s I made the mistake of listening to a sibling who had a "hot tip" for a stock that was supposed to triple within 6 months. Of course after 6 months it had lost 75% of its value. When the sibling's broker tried to convince me to move to another "hot" stock, and included in his reasons for why the stock would grow whether an AFC or NFC won the Super Bowl, I ran away screaming into the night from this. Along with high trade commissions, and money market funds that then were paying very high rates, I avoided anything but money market funds.
In 1984 my older co-workers finally convinced me to open a 401K. At that point I started understanding asset allocation and reading about mutual funds, subscribed to Barrons and Money Magazine, and started to read the Wall Street Journal. I started hearing about folks like John Bogle of Vanguard, Peter Lynch at Fidelity, John Templeton, and Warren Buffet. I took a personal finance course at a local community college. I started investing in mutual funds outside of my 401K in the late 1980s. I got into (at a small scale) individual stocks in the mid 90s, when our savings had grown to where I felt comfortable risking some money there, and discount brokerages for cheap trades became popular.
In addition to Barrons and Money Magazine, Key books for me in the late 1980s and 1990s: there was a "New York Time Personal Finance/Investment Guide", I think that was the name. I forget the author, a female I believe. It gave for me a very comprehensive introduction to personal finance and the role investing played within it. "Master Your Money" by Ron Blue. "The Truth About Money" by Ric Edelman. "The Millionaire Next Door". These all helped me see investing less as gambling and looking for quick returns, and more as a long term strategy for asset growth and retirement planning.