Dealing with PDFs is, IMO, for the more experienced converter - they do what they do well, but weren't designed for use on eBook readers. I'd advise avoiding them like the plague until you get the hang of the simpler reader format to reader format conversions (mobi-ePub, Lit-ePub, etc.).
Or, as already said, download books that are already ePubs.
Stick at it though, there's a certain satisfaction in having done the conversion yourself.
I'd suggest ignoring pdb & txt files as well - again it's harder to get an acceptable end result from these.
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