I am currently learning R and want to do a practical project using R programming language can you please suggest any particular topic/data set I can focus on. I am interested in gene expression analysis.
If you're able to learn some command line to utilize tools like Salmon, DESeq would be a great tool to use. A workflow can be found here.
If you want to skip the first command-line-based steps, you could start from the read counts using the recount package and their workflow
EDIT: Some background info -- both, Giovanni and me, recommend you dive into comparing the gene expression profiles derived from RNA-seq for multiple samples. That's a classical bioinformatics and R-based analysis called differential gene expression -- you may want to read up on the general details of RNA-seq before you start the analysis so that the results make more sense. Conesa et al., 2016 might be a good starting point.
Hi, I edited your post, this is a question, not a tutorial.
Regarding your project, first I will take a look into R-related packages (limma, affy, edgeR, DESeq)
Thank You will look into it.