whats the hardest part about doing Research online?

The hardest part about doing research online is finding sources that are credible or are worthy of using in your work. If you don't have good research, or research from articles, books, or other good sources, your paper (I'm assuming you need to write a research paper?) will be very weak. Think of it as finding information about the latest gossip in school. Would you listen to your best friend when they say your boyfriend is cheating on you or would you listen to someone you barely know :P. Basically, you have to know the difference between a good source and a bad source.

The hardest part is usually finding the topic it self

Probably finding sources that aren't properly referenced which will lead to possible accusations of plagiarism .