Many website are blocked in a few country.
So, if we want to use google search or watch video in youtube, you need to use some tricks. The online web proxy is a convenient method. But I am not sure that whether it is safe or not. You should not sign you account on these proxy.
1)https://www.freeproxyserver.co/
2)https://proxysite.io/
3)https://www.proxysite.com/
4)https://www.vpnbook.com/webproxy
If these proxy are invalid, you should go to www.searx.me to search online proxy, you will find a useful one.