Drupal 8.x

Within a Page Template, how Could I check if a Paragraph field if present?

I'm using this and it works:

$node->hasField($field_paragraphfield)But how can I modify this to look for a field within that field?

I tried this but it doesn't work:

$node->hasField($field_paragraphfield_banner)

I understand Drupal is free, but is it very large if I download it to a personal computer? Will my laptop be able to handle it?

I am running a Drupal site since Drupal 4 days.............It got upgraded from Drupal 7 to 8 successfully and now it is running Drupal 10.

Before Drupal 8 I was having a block showing recent comments as table with 1. comment subject, 2. author, 3, node title and 4 date-time as fields. I had put code to change the node title to an alternate title (say title_mf which I have in a different table with additional/alternate data for nodes ... node_alt_data)

Hello Everyone,

Hope you all are doing well !!

I am a fresher here to Drupal, and my problem statement is as follows:
There is an existing Drupal code (.info and .module files only in repo), which needs to be promoted to Drupal9 which will contain .info.yml file, I have tried to manipulate existing one, but it throws error saying "Missing 'application'" which is added in my dependencies in .yml file. I am attaching screenshots for reference and looking forward for some dedicated support please to fix this error.