should i use 301 redirect on .htaccess file or not

Hi,

My current website url is: http://www.example.com and I will release a completely new website that will use a SSL Certificate and because it’s a full new website all the url’s will be new and different from the “old” website. I'm using Hostforlife.eu hosting service, they told me to use the following lines on my .htaccess file:

But when researching for this on google, I have found many websites telling that we should always use a 301 redirect and to do that the .htaccess file should be:

So in order to resume, it’s the same domain, but now with a SSL Certificate and a full new website. In this case do I need to use the 301 redirect on my .htaccess file?

Thanks