Since the middle of the twentieth century, the yield of crops has been achieved through traditional breeding practices. With the advancement of molecular technology and statistical models, breeders now have enhanced the capacity to select desirable phenotypes with the aid of genotyping information. Whole-genome analysis and information also become valuable input in this regard. This innovation has resulted in more accurate and efficient crop growth using genome-based approaches, including molecular markers, genomic selection (GS), and genome editing. Molecular markers, particularly single-nucleotide polymorphisms (SNPs), are critical for identifying genomic regions linked to crucial characteristics, boosting breeding precision and efficiency. Genomics, genetic markers, reference genomes, protein and sequence databases, transcriptomes, and even gene expression profiles have equipped plant breeding with essential resources. These resources assist with feature identification, broaden the understanding of genetic variation, accelerate genomic mapping, facilitate marker-assisted selection (MAS), and improve genetic mapping thereby speeding up breeding activities. The use of Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)/Cas9 techniques for gene editing advances the pace of the breeding process. These methods, particularly marker-assisted selection (MAS) and genomic selection (GS) enable accurate selection and outcome prediction, which in turn increases yield, disease tolerance, and stress resilience in plants. Such methods are vital when dealing with advanced traits influenced by numerous genes and environmental factors. This chapter discusses in detail the integration of molecular tools into modern crop engineering, underscoring their benefits, applications, and power to change the agricultural industry.