SSL Certificate and mixed content

hello, i am having trouble making my website secure. i have activated the SSL on with my web host provider and have redirected the domain using htaccess by copying this code;

#Rewrite everything to https
RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

but now the website is saying it is partially secure. What does this mean and how can i resolve it?

This issue comes when your website url is https and you are loading some js or css files with http.

Change all the links from http to https