undefined index and curl error

after trying to install ssl cert on site i got completely locked out of site i managed to get back to website but as you can see on topp of site it has this error written on top of website

Notice: Undefined index: hide_admin_notices in /var/www/vhosts/52/154042/webspace/httpdocs/brownebrothers.ie/wp-content/plugins/better-font-awesome/better-font-awesome.php on line 294

and when i tried install a plugin this happens

Installation failed: Download failed. cURL error 77: error setting certificate verify locations: CAfile: /var/www/vhosts/52/154042/webspace/httpdocs/brownebrothers.ie/wp-includes/certificates/ca-bundle.crt CApath: none

i’ve no backups of site can anyone please help

website is loading over https and i dont think its installed properly

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