Descartes was looking for a secure fundamental of certain knowledge and that he could use either for philosophy or science

Descartes was looking for a secure fundamental of certain knowledge and that he could use either for philosophy or science. The Cartesian method of doubt is a method that leads to the right and undoubted knowledge. The doubts that are listed on Descartes method are the sensible doubt, the dream doubt and the metaphysical doubt. The sensible doubt is the one that lead us to not trust a hundred percent in ours senses and everything we learn throughout them. The dream doubt is the one that show us that we cannot be sure if we are awake or dreaming in that moment. What I have learned reading about Descartes is that he was not a crazy guy, lunatic suffering of obsessive thinking, but a philosopher that used the doubt as a weapon on his journey through the knowledge. Reading about Descartes and his methods I learned there are tons types of knowledge, but the most important thing is to not trust a hundred percent in all knowledgr that is pass to us and that we need to question them