Learning Chinese tones is crucial for developing proper pronunciation and communication skills in the language. Fortunately, there are several free resources available to help you learn Chinese tones effectively. Here are some of the best ones:

1. Yoyo Chinese Tone Course: Yoyo Chinese offers a comprehensive online course specifically designed to teach Chinese tones. The first few lessons are available for free, including detailed explanations, audio examples, and practice exercises.

1. FluentU: FluentU is a language learning platform that provides a wide range of resources, including videos, audio clips, and interactive exercises. Their Chinese course incorporates tones and pronunciation practice to improve your overall language skills.

1. ChinesePod: ChinesePod is a popular podcast and online learning platform that offers free audio lessons for learning Mandarin. They have lessons dedicated to Chinese tones and pronunciation, which you can access without a subscription.

1. HelloChinese App: The HelloChinese app is a gamified language-learning app that covers various aspects of Mandarin Chinese, including tones. It provides interactive exercises, pronunciation practice, and tone recognition exercises to improve your tone skills.

1. YouTube Channels: There are several YouTube channels dedicated to teaching Chinese tones. Some noteworthy channels include ChineseFor.Us, Mandarin Corner, and ChineseClass101. These channels provide video lessons, pronunciation guides, and practice exercises.

1. Online Tone Drills: Websites like iCantonese and TonePerfect provide tone drills and exercises specifically designed to improve your tone recognition and pronunciation. While these resources focus on Cantonese tones, the concepts and exercises can be useful for learning Mandarin tones as well.

1. Language Exchange Platforms: Joining language exchange platforms such as HelloTalk or Tandem can help you connect with native Mandarin speakers. Engaging in conversation with them can improve your understanding and production of Chinese tones.

Remember, while these resources can be valuable for learning Chinese tones, it’s essential to practice with native speakers and get feedback on your pronunciation. Consistent practice and exposure to the language will help you develop a better understanding and mastery of Chinese tones over time.