Enhance Webflow Landing Page & SEO

The job is to work on our existing landing page on WEBFLOW
We want you to:
- Boost the SEO basics and main tasks for this page (please list out your plan).
- ADD a new page section called "blog / news" to post articles and content
- Teach us how to generate a new page and article by ourselves
- correct typing mistakes
- change 1 picture of the current landing page.
- Make sure to have a optimum dipslay of landing page BOTH on desktop and mobile screen (not the case at the moment).

If you want to see existing Webflow page here it is: https://www.mapeluchepersonnalisee.com/

PS: We will check if below aspect are obtained.
Display on google search.
A detailled check of webpage display, wording, typing mistake, page loading speed).
Here below the GTmetrix objectives before to end the project:
Overall GTmetrix Grade
Grade A (90-100%):
Largest Contentful Paint (LCP):
Under 1.2 seconds
Total Blocking Time (TBT):
Less than 150 milliseconds
Cumulative Layout Shift (CLS):
A score below 0.1
Performance Metrics
Performance Score: Aim for a score of 90 or higher.
Structure Score: A score of 85
Fully Loaded Time:
Under 1.5 second is excellent