Google Scholar
This tool specializes in searching exclusively through scholar articles and publications. Even academic workers use it regularly due to some key advantages like universality and automation, meaning that new information does not have to be added manually, like in a manually curated database – on the contrary, it is retrieved automatically from all over the net using algorithms.
Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computing, history, art history, economics, and more, including K-14 and test preparation (SAT, Praxis, LSAT) content. We focus on skill mastery to help learners establish strong foundations, so there's no limit to what they can learn next!
The National Library of the Philippines provides access to various online databases that offer a vast range of peer-reviewed and reliable sources of information. Check out their infographic to be guided on how to gain access for free or visit https://eportal.nlp.gov.ph/.