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Bioinformatics demands knowledge of various inter-linked subjects. This page provide links of some the good computer, biology and related tutorials.
Introduction to computer science
Introduction to Internet
Basics of HTML
Java Tutorial
Perl Tutorials
XML Tutorial
SQL Tutorial
Oracle Tutorial
C and C++ Tutorial
CGI Tutorial
Unix Tutorial
Basics of Biology
Basics of Chemistry
Introduction to BioChemistry
Understand DNA
About RNA
About Genome
Similarity Search Tutorials
Feel free to add more useful tutorial links for bioinformaticians in comment section.