Prevent Editor from altering certain posts / pages

Hi There,

I am fairly new to wordpress so forgive me if this has been covered!

I am using WordPress to build a site for a client (https://www.truescale.co.uk).

If you look at the front page of the site, the ‘services’ are actually posts that are pulled into the front page.

I do not want my client to have the ability to edit these as they could be easily broken, but I do want him to be able to create new posts.

Is there a way to effectively lock certain posts / pages?

Thanks in advance