https://ods.od.nih.gov/factsheets/list-VitaminsMinerals/ These “Vitamin and Mineral Supplement Fact Sheets” from the NIH Office of Dietary Supplements are good resources for information about individual vitamins and minerals. For less detailed and easier to understand info, select the “Consumer” version of the fact sheet for a given nutrient. For a more detailed version, select the “Health Professional” version. Note that this page does not include information on essential fatty acids or essential amino acids.
For more general information, you may also want to refer to the 2020-2025 Dietary Guidelines for Americans: https://www.dietaryguidelines.gov/resources/2020-2025-dietary-guidelines-online-materials