Hide dashboard menu

Hi Hope someone can gudie me please.
Is it possible in WP to hide the main part of the dashboard.

I have just built a site for a charity and they want to add content to the posts and pages, however they are not computer literate and I am afraid that once they get into the back office curiosity will cause someone to try to edit plug ins etc.

Is there a way that I can hand the website to them so that only the posts to content appears for access the rest od the menu is hidden from prying eyes.

I would still need access to the hidden entries to keep certain parts up to date.

Is this possible please

Any help warmly appreciated.