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!

Well your composer is saying that your PHP version is 7.0.33, could you check if you have multiple phps installed?
To check your PHP version:

Code:

$ which php

$ /usr/bin/php
$ php -v
$ PHP 7.4.11 (cli) (built: Sep 29 2020 10:17:06) ( NTS )

if you have the right version and you still get the errors try locating all php version on your system

Stackoverflow: [/url][url=https://stackoverflow.com/questions/28318041/how-to-check-if-there-are-multiple-versions-of-php-installed-on-ubuntu-12-04-lts]How to check if there are multiple versions of PHP installed on Ubuntu 12.04 LTS - You could try this on Debian machines.

Regarding to ext-intl, if you're running on a Linux Debian machine simply run the following command to install it.

Code:

sudo apt-get install php7.2-intl

please note the version which is being installed (php7.2).

and about installing myth using composer, I have not tried that, I took the source and implemented it manually, changing Myth's default Namespaces to your application and placing the Myth files in their respctive directories would do the job.

Good Luck.