Magento 2.2 - Add recaptcha in back up and main sites. Add static block in home page with extra texts/ conternt/images and check home page static block to add safe extra content

Magento 2.2 - Need to stop spam register process for spam/fake customers/ especially with [login to view URL] emails. Need to be added Google ReCAPTCHA or whatever will eliminate the issue. In one magento site we added recapcha looks to block bulk spamming registration. So recapcha looks to work Also need to add a static block in home page in order to add additional contents/ texts and some photos and videos. Need to check the home page static block because when we update and save it the home page menu template corrupted. Need to start first in back up sites in two Plesk and in one Cpanel server and then to main sites. Need minimum 48 hours to check the results. Full written instructions how could we add the above tasks to the rest main sites