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I'm interrested in bioinformatics. I would like to know where should I begin ? Should I take learn the basic of biology before starting or should I approach it with informatic first (like rosalind appear to be)? Is this link a good starting point ?

Thanks. (I hope it's not too much off-topic)

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Bioinformatics is mostly about translating and searching in big chunks of data.

You'll need to study genetics, and also some computer skills, a couple of programming languages will help a lot.

some links to taste the waters:

Perl is one of the weapons of choice to find things inside big strings of text: http://www.bioperl.org/wiki/Main_Page

Not the only tool in the city, of course: http://biopython.org/wiki/Main_Page

http://www.biolisp.org/

if you want to use lisp, you'll probably will find useful to be able to use perl regexes in lisp, several candidates here, but cl-ppcre and optima are popular

I got into bioinformatics as a sysadmin, and loved it. You are right on the money with your links, but what I would say is to first take the time to learn the general overview of genetics first. I would have been so lost managing the data I did if I hadn't taken the time to listen to all the latest lectures on genomics. I would also encourage a heavy emphasis on bacteria and the microbiome, it's largely an unexplored wilderness.

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