link_field.md

Ok, so

• $thingie is your node, or paragraph, or whatever. You're probably writing this code in your thingie's preprocess hook
• field_link is the link field whose data you're trying to access

// Check that the field exists and isn't empty
if ($thingie->hasField('field_link') && !$thingie->field_link->isEmpty()) {
  $text = $thingie->get('field_link')->first()->title;
  $url = $thingie->get('field_link')->first()->getUrl()->toString();
}