This is not a textbook! This book is a treasure chest filled with explanatory and motivational contributions that perfectly align with the lectures in the first year of a mathematics degree. As someone interested in mathematics, you will enjoy having this book at your side, regardless of your field of study. The authors provide thoughtful and targeted assistance for many common beginner difficulties. They make clear and applicable what is often overlooked in lectures. And they know exactly where problems can arise, as they were once beginners themselves and remember it well. This book speaks to you like an advanced student who can explain things well: "Mathematics for Beginners!" All articles were originally written for the website Matroids Matheplanet and have been carefully reviewed and improved in content and pedagogy for this edition.