The deception methods that were applied were truly remarkable, they used decoy tanks and sent people out to imprint fake tank tracks into fields.
They also understood IR and would shield real troops while leaving coal to burn in empty pillboxes and bunkers
There was also the shoot down of the F-117A by what was effectively a rag-tag group of AA who planned the operation and pulled it off
A lot of what was learned in the earlier Bosnia campaign was applied later in '99 - not just the use of decoys and microwaves, but using spotters to track the regular flight paths of incoming fighters and intermittently switching radar off and on (this is how Scott O'Grady was shot down in his F16)
Gen. Wesley Clark was a huge advocate of the doctrine that you could win wars with air power alone and never have to sacrifice ground troops - that thinking changed after '99
[0] note that I in no way condone the overall goal of what took place there and those same family members would be the first to tell you it was horrific