To answer your second question: Most to all public companies release annual reports (e.g. 10-K) where they explain what they do and what they are planning to do

To answer your second question: Most to all public companies release annual reports (e.g. 10-K) where they explain what they do and what they are planning to do. To deepen your understanding of other sectors I would recommend reading/skimming a couple of these annual reports. I think this will give you a good start understanding what a sector is doing and also specifically how a company in the sector is doing. For example, you want to know more about oil? Read some of the annual reports of the biggest oil companies: 1. SNP - https://f.hubspotusercontent20.net/hubfs/527622/0-Assets/Investor%20Relations/Corporate%20Governance/Gesch%C3%A4tsbericht%202020/SNP%20GB%202020%20EN.pdf https://f.hubspotusercontent20.net/hubfs/527622/0-Assets/Inv... 2. PTR - http://www.petrochina.com.cn/ptr/ndbg/202104/eafc059543d2429ab3ad454d519cde56/files/a1e7963d63a9429d8226c56c19928dc8.pdf http://www.petrochina.com.cn/ptr/ndbg/202104/eafc059543d2429... 3. RDSA - https://reports.shell.com/annual-report/2020/ https://reports.shell.com/annual-report/2020/ 4. BP - https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/investors/bp-annual-report-and-form-20f-2020.pdf https://www.bp.com/content/dam/bp/business-sites/en/global/c... 5. XOM - https://corporate.exxonmobil.com/-/media/Global/Files/investor-relations/annual-meeting-materials/annual-report-summaries/2020-Annual-Report.pdf https://corporate.exxonmobil.com/-/media/Global/Files/invest...