critical problems

I’m working on the wordpress site via localhost and I’m having trouble importing a demo of some themes. I ran the diagnosis and 3 critical problems were trimmed, how do I solve it?

I’m using Mac
XAMPP

1)
The REST API is a way that WordPress, and other applications, communicate with the server. An example is the block editor screen, which depends on the API to display and save your posts and pages.

The request to the REST API failed due to the following error.
Error: cURL error 7: Failed to connect to localhost port 8080: Connection refused (http_request_failed)

2)
Background updates ensure that WordPress can update itself if a security update is released for the version being used.

Warning It was not possible to confirm that the wp_version_check () filter is available.
No version control system has been detected.
Your WordPress installation does not need FTP credentials to perform updates.
Error Some files are not writable by WordPress:
xmlrpc.php
wp-blog-header.php
readme.html
wp-signup.php
wp-cron.php
wp-config-sample.php
wp-login.php
license.txt
wp-mail.php
wp-links-opml.php
wp-load.php
wp-includes / class-wp-user-query.php
wp-includes / l10n.php
wp-includes / date.php
wp-includes / class-wp-oembed.php
wp-includes / images / blank.gif
wp-includes / images / down_arrow.gif
wp-includes / images / spinner.gif
wp-includes / images / media / interactive.png
wp-includes / images / media / default.png

3)
Loopback requests are used to run scheduled events, as well as by some theme editors and plugins to check code stability.

The loopback request for your site has failed, which means that features that depend on it are not working as expected.
Error: cURL error 7: Failed to connect to localhost port 8080: Connection refused (http_request_failed)