New to digital audio

Hi I'm new to the digital side of audio. I have imported all my cd's onto a older laptop. I then load all the songs on my IPOD. I have a great 2 channel system and currently use a audioengine bluetooth receiver plugged into my preamp to play my ipod thru  my system. Is there a way to improve my sound doing this ? I'm really into music - but in all the reading I do about digital I find it totally confusing ie: bit rates, jitter, etc. FYI - for this system - I use a Emotiva XD-1, a Parasound HCA MK1200 II amp and a new pair of the Polk Audio LSIm 705's Thanks, Bob