Search in Google or GoogleScholar if you look for information you cannot retrieve from elsewhere. This may be information that is so new it has not been published in academic journals yet.
Tips: If you know the title of an academic article, the easiest way to retrieve the pdf is to search in GoogleScholar.
Other important fulltext databases from publishers and organisations
Nature is one of the most cited scientific journals in the world. Nature publishes research on all fields within natural science and technology
High quality literature improves your thesis