wat are the best apps for 12.04 lts

please help me

Welcome. You need to give WAAAAY more information than that. This tells us nothing, so you could rightly expect the same.

You could assume that one of the best Linux OS's would use default apps that are ideally suited to it. Check out what you already have. Opinions may differ of course.

As said: More info is a prerequisite for detailed replies

Open the software centre and click on the most popular apps section.

Depends what you're objective is, but on a clean install the 1st things I install are:
ubuntu-restricted-extras, clementine, k3b, rubyripper, keepassx, luckybackup, google-chrome, skype, devede, gimp, ubuntu-tweak & exfalso, plus several other codecs.
But of course this just suits my needs, yours may well be different.

Pioneers.

This has been asked many many times, moved to Recurring.