Only those who understand the language of investors and analysts can systematically invest in bonds and secure the best opportunities to achieve good returns with them. Rüdiger Götte begins his introduction to the world of interest and bond products with a brief tour through financial mathematics, interest, annuity, and amortization calculations. This perhaps surprising thematic entry proves to be important and valuable, as the presented calculation fundamentals are encountered by investors everywhere in the world of interest products. They form the backbone of these products. Only those who are familiar with them can assess interest products and thus separate the wheat from the chaff. Subsequently, Götte examines the various interest investments, spanning from savings accounts to savings bonds, bonds, pension funds, and many other investment products, describing each in detail.