No worries!

One thing I didn't mention is value vs growth, and you'll see that a lot. Basically, "value" means companies that are undervalued by the market, and "growth" means companies that the market believes will continue to grow (i.e. higher dividends, established brands, etc). Funds that provide one over the other are betting that one will outperform the other, and people are on either side. I think that if picking winners was that easy, everyone would do it, so I instead just try to build a balance.

But anyway, there are a few resources I really like that can help if you want to dig further:

• Bogleheads wiki - Jack Bogle started Vanguard, and this wiki is dedicated to low-cost, index-fund investing; there's a ton of great info there, and it goes pretty deep
• Investopedia - I don't recommend browsing the site, but if their content shows up on a regular search, they're usually pretty high quality
• The Money Guy - YT channel more about personal finance than investing, but they have some great videos and I rarely find something I disagree with; I think their advice is much better than Dave Ramsey (and Ramsey's investing advice sucks, steer clear), and I haven't found a better, general purpose PF resource on YouTube

Have a great day, and don't hesitate to make another post here if you have questions.