How do you research stocks and learn swing trading as a complete beginner?

How do you research stocks and learn swing trading as a complete beginner? I’m new to the stock market and want to learn **both investing and swing trading** properly. I don’t want to just follow tips from YouTube, Instagram, or other people. If you had to teach someone from **absolute zero**, where would you start? For **stock investing**: How do you choose a company to research? How do you understand what the company does? What things do you check? How do you know if the company is doing well? How do you know if the stock is too expensive? How do you find problems with the company? For **swing trading**: How do you find a stock for swing trading? What charts or indicators do you look at? How do you decide when to buy? How do you decide when to sell? How do you set a stop-loss? I would really appreciate it if experienced people could explain their process in **very simple language**, like you’re teaching a complete beginner. **If you were starting again from zero, what would you learn first?**