1. List all the languages you have mastered, including mother tongue and second language.

2. Describe the proficiency of each language.

3. If language skills are frequently used or important in certain fields or occasions, such as working in multinational companies, translation, interpretation, etc. You can emphasize these skills in your resume.

4. If you have relevant supporting documents, such as language proof and translation proof, you can list them in your resume to increase your credibility.