TCGA data assessment
TCGAbiolinks Bioconductor package is the most suitable tool for assessing TCGA datasets on a systematic and integrative fashion. One must, therefore, be familiar with the R environment/language in order to properly use it.
In case you are wondering how to simply extract TCGA gene expression quantification data and prepare it for running your own DE analyses and/or look for some genes of interest, we have worked on this brief tutorial aiming at supporting our community on performing such task.