This lecture overview delves into how microbial genetics shapes the success of antibiotic treatments. It highlights mutations and genetic transfer as the key forces driving bacterial evolution and survival in the face of environmental challenges. The discussion covers diverse antimicrobial strategies, from breaking down cell walls to blocking vital metabolic pathways, and reveals how clinicians assess drug potency through diffusion and dilution tests. A major focus is the escalating threat of antibiotic resistance, fueled by natural selection and human error. Ultimately, it emphasizes that combining drugs strategically and thorough patient evaluation are vital weapons in outsmarting today's resilient bacteria.