Gifts carry meaning
In many cultures, gift-giving is a meaningful ritual rather than a casual act. In Japan, presentation and wrapping matter as much as the gift. In China, certain items (clocks, sharp objects) carry unlucky associations.
What to avoid
Research before giving: some flowers signal funerals, some colors signal mourning, and some numbers are unlucky. Avoid overly expensive gifts that could embarrass the recipient or imply obligation.
Universal good practices
A thoughtful gift from your home country is usually well received. Present gifts with both hands in many Asian cultures. Don't be surprised if gifts aren't opened immediately — in some cultures that's polite.