How to redirect an entire website

Hi all, I need some advice. 

I want to change my website's domain name, but I don't want to lose all the backlinks from the old domain. Essentially, I'm taking my business from thesuitest.co to thesuitest.com. I have tons of pages and subpages because my website is a digital magazine, so creating individual redirects seems like tedious work that's going to take a lot of time. I'm also not even sure if I can redirect the .co links to .com in Squarespace once I change the domain there. Would I have to do that on my server?

So what I am wondering is: is there any solution to redirect all of the old links to the new one? (I will obviously keep the .co domain so that this redirect will be possible) And how do I go about doing this? I just don't really know where to start with this project.

Any help or resources or advice is appreciated! 

Hello, I need help with my domains.
I have two domains one of them with website and the other without anything

I need link them so when I open the domain link its take me to the other domain.

Ex: when I open link: www.example.com

Its change to other link: www.example2.com.

Simply link both domains to your website, set your preferred domain as the primary domain.