Book excerpt: This manual provides insights into the theory and practical aspects of several biotechnological and biochemical techniques for plants, protozoa, nematodes, insects and fishes, as well as human samples. The book also covers bioinformatics tools. The manual is an inclusive compilation, explaining techniques for microbial cultures, their diagnostics, DNA barcoding, microscopic techniques, blood analysis, parasite diagnostics through copro-antigens, enzyme analysis with enzyme kinetics, gene expression analysis, in-vivo protein visualization in live animals, geno-toxicity assays, quantification of micro RNAs and LncRNAs in tissue sections, the use of droplet PCR, and in-silico analysis. It provides step-by-step descriptions and details of each methodology, together with the final outcomes and inferences, in a simple and lucid manner, easily reproducible even for beginners. The broad range of techniques covered makes this volume extremely useful in understanding the principles of biotechniques, and simple applications for practical courses.