General tips

Writing is one of the key skills that you should practise again and again.

Some good tips to improve your writing skills can be found here.

In order to find topics to write about, have a look at this website.

And you may also consult Grammar Girl, who offers quick and dirty tips for better writing.

Creative writing

If you need inspiration, have a look at the following websites:

Writing certain kinds of texts

Outline, analyse, comment, discuss, describe, writing letters - there is so much you can do.

And you always need linking words. (Excellent collection for the Oberstufe.)

More material/links to come... but always bear in mind what is important in order to understand what you are writing about: