Publications and reports from non-governmental organizations (NGOs), intergovernmental organizations (IGOs), and state governments are useful sources to help you understand international law topics and situations in specific countries. Examples of NGOs include Human Rights Watch and Amnesty International. Examples of IGOs include the United Nations or the African Union.
Google Advanced allows you to run targeted searches across regular Google and limit your results to certain file types (e.g., .pdf) and/or search across a particular website (e.g., https://www.hrw.org) or domain (e.g., .edu, .org, .gov). The .int domain is reserved for international treaty-based organizations, UN agencies, and organizations or entities with observer status at the UN. The .org domain is often used by non-profit organizations, but can now be used by anyone.
Using Google Advanced is particularly helpful when searching across government or NGO websites because these type of websites often lack great search functions.