[header] How to wish someone good luck [title] Keep it simple-say' good luck! [step] " one of the best and simplest ways to wish someone luck is use that very phrase. " good luck! " is straightforward, heartfelt, and almost impossible to get wrong. [substeps] Make sure that you sound sincere. 
If said in the wrong tone, this phrase can be interpreted as sarcasm. So make sure that the person understands your sincerity when you express the sentiment.