These tutorials help those with some familiarity of R or Python.
This tutorial shows how to navigate between tables of data using R instead of Excel.
This tutorial describes data visualization techniques in R using the base library, ggplot library and other specialized libraries (e.g. Venn diagram, heatmap, logo plot, phylogeny, etc.).
This tutorial describes gviz, ggbio and Rcircos libraries for viewing genomic data.
Pandora's Toolbox describes a set of efficient bioinformatics programs.