Capital letters

You don't need to use capital letters as often as you think!

It's very complicated, but a good rule of thumb is to capitalise at the start of sentences, names and places... and nothing else.

For example:

I like to go hiking in the Alps.

I live in Vienna.

My name is Bob.

There are some additional things that should be capitalised, like nationalities and religions:

For example: 

All Christians adhere to Christianity and follow the teachings of Jesus. 

The French president is called François Hollande.

So while you would say:

I am Italian.

you would also say:

I am a biologist.

There are some grey areas. The subject you study at university if often the title of your degree (so capitalised) but also a general subject (so not capitalised).

For example:

Both are correct:

I study law at the University of Vienna

I study Law at the University of Vienna