Website courses - ten a penny - what's most useful?

[notmytype]

Many of the jobs I am interested in seem to involve experience in updating company websites, adding content, writing etc...I have none of this!

But I am fairly adept at other software packages and can do Powerpoint, Excel and Word and have tinkered round with various photo editing packages (cropping, adjusting exposure levels etc.)

I know I would have to convince on the "writing" side of things but what courses could I do to increase my chances with regard to the actual technical side? I would prefer an intensive type of course but what sort of course should I do? I am ignorant of the most useful packages.

Any advice?