Reply to Tips for beginners! (Me)

Long story short I have been mixing on a mixtrack pro and vdj pro 7 for about 8 months and I just recently purchased an S4, I was reading someone that you should never touch the cross fader and only transition between songs by the volume controls? Is that true? I have always done the cross fader but I could never get those instant crosses that sound like nothing was changed. I just want to be able
To mix smoothly and make it sound good! Please give me some tips!! Thanks DJTT!