Wordpress From Bitnami wordpress to Centminmod

I am trying to move my site which is currently running on bitnami stack to centminmod.
I need help in understanding some basic file configuration and permission as centminmod is slightly different from bitnami.
1. In bitnami I used to change file permission of different files using sudo chmod to deny file permission. For example:

Code:

sudo chmod 640 /opt/bitnami/apps/wordpress/htdocs/wp-config.php

This command will deny writing permission to wp plugins. Do I need to do these similar setups in centminmod too. If yes, then how?
2. How to add expires header in centminmod wordpress?
3. How to make .well-known directory publicly accessible to verify our domain on apple-pay?
In bitnami I used to add this code in

Code:

/opt/bitnami/apps/wordpress/conf/nginx-app.conf

Code:

location ^~ /.well-known/ {
allow all;
default_type "text/plain";
}

4. Do I need to install redis individually even if I have installed wordpress by centmin command on option 22 with 2 as option for install wordpress with redis.
If redis needs to be installed individually then is this guide would be helpful.
Redis - Insight Guide - How to install Redis server on Centmin Mod LEMP stack
5. I want to issue letsencrypt certificate on my domain as www.domain.com as the primary name but during vhost creation on option 22, I need to enter domain without www. Then how to issue letsencrypt certificate on www.domain.com as primary name.
6. Which one would be better RediSearch or Elastic Search and how to install it for woocommerce store?

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I know these things but I really appreciate your kind post. Thanks a lot for taking out your time for trying to help me. I really appreciate your kind gesture.
Thank you tininho!!!