creating a registration system with CI4, and why is CI "better"?

Starting fresh, no it is not that hard to implement.
instructions are very clear and Myth:Auth is amazing with a lot of fun futures including roles/user groups/permissions etc...
if you are new to CI though, you might want to get yourself familier with the core concepts of CI so you can better implement your Myth:Auth to your application.

I'm new to CI but not coding.  I did a lot of C++ in the mid 90's and have dabbled with PHP for several years.  I'm hungry to learn!!

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This has already been built for CI 4 DRY

Myth:Auth

And if you also need this with an admin dashbaord

CodeIgniter 4 Application Boilerplate

Hmm....I tried to install/update Composer in console but got this:

Code:

Problem 1
    - This package requires php >=7.2 but your PHP version (7.0.33) does not satisfy that requirement.
  Problem 2
    - The requested PHP extension ext-intl * is missing from your system. Install or enable PHP's intl extension.

and a bunch more.  I have PHP 7.3.22 so I don't know what's up.  Also, once composer is updated, how do I install myth?  I've already manually installed CI4 and have it running.  Thanks!