Getting the hang of it

I believe the journey of a Windows user into the Linux world would be similar for everyone. In my case, after starting off two months back, today I find myself being able to do most of the stuff that I want to do as easily as I could in Windows. Most significantly, I do not feel too tied down by the shortcomings of the GUI and do not mind relying on the commands to overcome these.
Some of the commands that I think a Linux user will need on a daily basis :

df -h: shows disk usage.
ntfs-3g : it is only required if the user still has data in NTFS partitions. This is used to allow writing into such partitions. There is a GUI for this tool, but in my experience using the GUI can be a pain. The menu will not launch the tool, and using the GUI produces results that are not always predictable. The command line is easier and can be launched as and when required.
dir/ls : both list folder contents. But the results are different and some distros do not recognise the dir command. ls is better since it is able to properly name filenames with spaces in them (with a "\" inserted).
[tab]: this is a sanity tool. When confronted with filenames like "filename.xxx-xx.xx.xx", a press of this button will autocomplete the filename freeing the user the headache of typing out the long list of numbers. Just using file[tab] is enough (unless similar named files also exist).
less : strangely named command that restricts the screen output to one page length. Especially useful when dealing with ls/dir output in a command prompt not launched from within KDE.