Yes, you can use your own knowledge and opinions to support your arguments in the Writing section of the IELTS Academic module. Here's how:

Understanding the Task
Before you start writing, carefully read and understand the task. Identify the key points and requirements of the question. This will help you form a clear opinion and support your arguments effectively.

Forming an Opinion
Based on your own knowledge and understanding, form an opinion on the given topic. Consider both sides of the argument, but choose a stance that you can confidently support with evidence and reasoning.

Developing Arguments
Once you have chosen your stance, brainstorm ideas and arguments that support your opinion. Draw on your own knowledge, experiences, and observations to develop strong and relevant arguments. Think about real-life examples, statistics, research findings, and logical reasoning that can strengthen your arguments.

Providing Evidence
Incorporate evidence into your writing to support your arguments. This can include personal anecdotes, case studies, expert opinions, or data from reliable sources. Ensure that the evidence is relevant, accurate, and enhances the persuasiveness of your arguments.

Explaining and Analyzing
When presenting your arguments, it's important to explain and analyze your points thoroughly. Use your own knowledge and opinions to provide detailed explanations and interpretations. Clearly demonstrate your understanding of the topic and its implications.

Writing Coherently
Ensure that your writing is coherent and well-structured. Use appropriate linking words and phrases to connect your ideas and arguments. Organize your paragraphs logically, with each paragraph focusing on a specific argument or aspect of the topic.

Conclusion
In your conclusion, summarize your main arguments and restate your opinion. Emphasize the importance of your stance and the validity of your arguments. End your response with a strong and memorable closing statement.

Final Thoughts
Using your own knowledge and opinions to support your arguments in the Writing section of the IELTS Academic module can greatly enhance the quality and depth of your response. It allows you to demonstrate critical thinking skills, creativity, and a deeper understanding of the topic. However, ensure that your arguments are well-supported, coherent, and relevant to the task at hand.