hey i am new here i created a web page how should i put google ads I went in get ads and created 720x90 ads now my web site has many pages can i enter the same code in all pages
Just paste the ad code where you want the ad to appear. You can also ad HTML effects to blend it into a page. If you have a blog, there are plugins that will help you display the ads on your blog.
Yes you can paste the same code in all pages but if you want to track each page earnings, then use different ad unit with different channels.