I have a result test saying Test is CRP. Conc is 0.6 Reference is 0.0-0.5 what is that mean?

No worries . CRP is a nonspecific marker for inflammation. Your results of 0.6 is very close to the normal range, and it is not concerning. Repeating the test in another 4-6 weeks can be of further reassurance. .
Really nothing. By itself, C-reactive protein means nothing. Reference ranges are set so that several percent of healthies fall outside on either end. This is at best one tiny piece of information used in weighing a differential diagnosis.