Learn to visualize gene expression data from NCBI GEO using R and ggplot2 in this hands-on bioinformatics tutorial. Master the creation of essential visualizations including barplots, density plots, boxplots, scatterplots, and heatmaps for RNA-Seq data analysis. Follow along with provided code and data to generate and customize each plot type, understanding the basic ggplot2 format and specific geom functions. Explore data visualization techniques step-by-step, from basic plot creation to saving your finalized graphics. Ideal for beginners in bioinformatics and R programming looking to enhance their data visualization skills for genomics research.