Here are three powerful tricks for online advertising:

1. Use targeted keywords to optimize your ad campaigns and appear in relevant search results.
2. Utilize retargeting to show ads to people who have previously interacted with your brand or visited your website.
3. Create visually appealing ads with clear calls-to-action that entice viewers to click and convert.

Remember to continuously monitor and analyze the performance of your ads to make necessary adjustments and improvements.

When writing about three powerful tricks for online advertising, make sure to focus on specific tactics that have been proven to be effective. Use data to support your claims and write in a clear and concise manner to make your points stand out to the reader. Remember to also consider your target audience and tailor the language and tone of your writing accordingly.