Frank_Breen2

My best advice is then to create 1 Blank Free-Form template, with just a basic blank template. From here create a a new Landing Page in Marketing Activities and open up the editor, drag in the HTML element - Custom HTML Editor - Adding Custom HTML to a Free-form Landing Page - Marketo Docs - Product...

Marketo has validation rules turned on for some fields, for example Email should be a valid Email Address, clicking on and off the field will activate the error message, other field types have the same sort of features, see here - Custom Field Type Glossary - Marketo Docs - Product Docs

There is two types of of Landing Pages, Free-Form and Guided:Create a Guided Landing Page Template - Marketo Docs - Product Docs Create a Free-Form Landing Page - Marketo Docs - Product Docs As long as you follow the guidelines, you can create the HTML externally and add it in.A great trick for fast...

Are you getting the ID using the API and then pushing it to the Lead record in your CRM?{{lead.ID}} looks like a custom field in your CRM and not an out of the box one from Marketo.

This is just Marketo's unique identifier for every record, it's not possible to call it out via a token in email or landing pages.

Do you mean this:

I don't think you can search by Lead ID, this is a Marketo only primary key.

Take a look at this Docs page: Show Custom HTML Form for Known Leads - Marketo Docs - Product Docs

Correct, Marketo only automatically inserts the width and height when you use the Insert/Edit Image in the Rich Text Editor.

Best place to start is here: Marketo Certified Expert Preparation Tools​.It has a Preparation Guide and a Practice Exam, this is where I started. If you have access to the University Portal they have great video tutorials and more there, if you don't have that, my best advice is to read Marketo Docs...