SEO and tracking scripts are a very important aspect to a landing page. These will be pushed to the landing page meta data in Marketo. You can find more information to where the meta data can be edited here.
These settings are specific
Here is more information to where the meta data can be edited in Marketo.
To add or edit the SEO or tracking scripts, go to the Info tab > Advanced Settings.
From here you can add keywords, meta tags and custom html for the Header and Footer for tracking.
SEO
Keywords
A list of words of search terms separated by a comma for SEO.
Meta Tags
The tags are used to define the content of share messages for SEO purposes.
Tracking
Header and Footer
Custom HTML and Javascript can be added to the page for further customization.
*If you add script at the brand level to the header/footer tracking script sections and you would like it to apply to previously created landing pages, you can lock the script at the brand level. When you open an existing landing page, it should populate with the script added at the brand level, then just make sure to resync the asset so that this change is applied to your MAP as well. If you leave the script unlocked this new script will only apply to newly created landing pages and not to assets created prior to this change.