To publish ads on Google, you will need to set up a Google Ads account and create an ad campaign. Here are the basic steps to get started:

1. Sign up for a Google Ads account: Go to the Google Ads website and create a new account. You will need to provide some basic information, such as your business name and website URL.
2. Set up a new campaign: Once you have an account, you can create a new campaign by selecting the type of campaign you want to run, such as search or display.
3. Define your targeting: Choose who you want to see your ads by selecting the targeting methods that best fit your business objectives, such as location, language, demographics, interests, etc.
4. Create your ad: Design your ad by choosing the ad format, writing the ad text, and selecting images or videos.
5. Set a budget: Decide how much you want to spend on your campaign and set a daily or total budget.
6. Launch your campaign: Once you have finished setting up your campaign, you can submit it for review and launch it when it’s approved.
7. Monitor and optimize: Regularly check your campaign’s performance, and make adjustments as needed, such as pausing underperforming ads or increasing your budget.

Please note that Google Ads has policies and guidelines that need to be followed when creating and publishing ads, if not followed, your ads may be disapproved or your account may be suspended.

Targeting Methods on Google Ads

There are several targeting methods available on Google Ads:

1. Keyword targeting: Allows you to show your ads to people who have searched for specific keywords on Google.
2. Demographic targeting: Allows you to show your ads to people of a specific age, gender, or parental status.
3. Location targeting: Allows you to show your ads to people in specific geographic areas, such as countries, regions, or cities.
4. Language targeting: Allows you to show your ads to people who have set their language preferences on Google.
5. Interest targeting: Allows you to show your ads to people based on their interests, such as sports or travel.
6. Remarketing: Allows you to show your ads to people who have previously interacted with your business, such as by visiting your website.
7. Custom Affinity Audiences: Allows you to show your ads to people who have shown an interest in a particular topic, by visiting relevant websites.
8. In-market audiences: Allows you to show your ads to people who are actively researching or comparing products and services in a certain category.
9. Life events: Allows you to show your ads to people who have recently experienced a significant life event, such as getting married or having a baby.
10. YouTube targeting: Allows you to show your ads to people who are watching videos on YouTube, based on their demographics, interests, and viewing history.

How to Optimize Google Ads

There are several ways to optimize a Google Ads campaign:

1. Set clear goals and track your progress. This will help you measure the success of your campaign and make adjustments as needed.
2. Use keywords that are relevant to your business and target audience. This will help your ads show up when people are searching for products or services like yours.
3. Use negative keywords to exclude irrelevant search terms from triggering your ads.
4. Use ad extensions to make your ads more informative and useful to potential customers.
5. Test different ad formats, such as text ads, display ads, and video ads, to see which ones perform the best.
6. Use remarketing to target people who have previously interacted with your business.
7. Use A/B testing to try out different versions of your ad and see which one performs better.
8. Keep your ad groups tightly themed, with a small number of keywords per ad group.
9. Keep an eye on your Quality Score and work to improve it.
10. Finally, regularly monitor your campaign’s performance and make adjustments as needed.