Are there any investing basics sites that focus on first-time investors and simple explanations?

Yes — there are several good investing basics sites aimed at first-time investors, with plain-English explanations and beginner-friendly guides.

Good beginner-focused sites

• Investor.gov (U.S. SEC)
  Very clear, official, and geared toward beginners. Good for learning basics like stocks, bonds, risk, fees, and diversification.

• Bogleheads.org Wiki
  Simple, practical investing concepts with a long-term, low-cost approach. Great if you want to understand index funds, asset allocation, and retirement investing.

• Fidelity Learning Center
  Beginner articles and videos explaining investing terms and account types in simple language.

• Charles Schwab Investor Education
  Good step-by-step beginner guides on getting started, portfolio basics, and goal-based investing.

• Vanguard Investor Education
  Useful for simple explanations of index investing, diversification, and long-term planning.

• NerdWallet Investing
  Easy-to-read articles on investing fundamentals, brokerage accounts, and how to start.

• The Balance
  Beginner-friendly finance and investing guides, often written in a straightforward style.

If you want the simplest starting point

A good order is:

1. Investor.gov
2. NerdWallet
3. Bogleheads Wiki
4. Fidelity or Schwab education pages

If you want, I can also give you:

• a top 5 list
• sites that are best for absolute beginners
• or a 1-week self-study path for learning investing basics.