Can somebody tell me what arpeggios are used in shredding often and scales? And, maybe some websites with examples I can use?

For scales, I reccomend natural minor and harmonic minor.
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As always, major and minor scales are most common, as are maj/min arps - however, get really into "shred" and you'll find almost every scale and arpeggio used at some point.

Speaking of which, THIS is a site with plenty of examples. In my sig, for example.