The above panorama I did was with Photoshop.. File>Automate>Merge , Hugin is an advanced panorama tool..the best!
Photoshop is a plethora of image editing tools. Lightroom is the set of useful image-adjustment-only tools in Photoshop.
For mastering the pp one can start with Picasa? to experience swift-basics, and then to Lightroom, which is more advanced and extensive.. All the special effects like text effects, HDR and creative edits are done best in Photoshop, although Lightroom has pLugins for every sort, but not very flexible in adjusting various elements.
also Lightroom is a NDE software, non destructive editing and very useful for sorting out our messy photography folders..