There are several ways you can find writing errors online:

Use a grammar checker : There are many grammar checkers available online that can help you identify and correct errors in your writing. Some of the most popular options include Grammarly, ProWritingAid, and Hemingway Editor. Simply copy and paste your writing into the tool and let it scan for errors.

Use a proofreading service: If you want a more thorough review of your writing, you may want to consider using a professional proofreading service. These services typically offer a range of options, from basic proofreading to more in-depth editing services.

Ask for feedback: Consider asking a friend or family member to review your writing for errors. Alternatively, you can post your writing in a writing group or forum and ask for feedback from other writers.

Use a writing resource: There are many online resources available that can help you identify and correct writing errors. For example, the Purdue Online Writing Lab (OWL) offers a range of writing resources, including guides on grammar, punctuation, and style.

Remember that it's always a good idea to carefully review your writing before submitting or publishing it. Don't rely solely on online tools or services – take the time to review your work and make sure it is error-free.