Great effort for this tutorial, thanks a ton, here are my notes if may help anyone, considering default install on WSL2 container
Note: composer added for Laravel framework.
These are NOT to be copy and pasted as it is, need to be selective as there are annotations beside some commands,
Also I've commented # some of the defaults written by the original editor due to mismatch to my current environment.
sha256sum  php-x.x.x.tar.gz => e847745fd66fc8c57fac993a609fefcded93fddccd225f0620a26bb5ae5753c3 
    tar zxf php-x.x.x
    sudo apt install build-essential
    sudo apt install -y composer nginx pkgconf libxml2-dev  libsqlite3-dev zlib1g-dev
    cd php-x.x.x
    ./configure --enable-fpm --with-mysqli <==Thank you for installing PHP.
        make <== takes a while 
    sudo make test <== optional as recommended
    sudo make install <= /usr/local/bin /usr/local/php
    sudo cp php.ini-development /usr/local/lib/php.ini
    sudo cp /usr/local/etc/php-fpm.d/www.conf.default /usr/local/etc/php-fpm.d/www.conf
    sudo cp sapi/fpm/php-fpm /usr/local/bin
    sudo vim /usr/local/php/php.ini <= cgi.fix_pathinfo=0
    sudo vim /usr/local/etc/php-fpm.d/www.conf <= user=www-data group=www-data
    sudo vim sapi/fpm/php-fpm.conf <= edit include=etc/php-fpm.d/*.conf  <- relative path
    sudo cp sapi/fpm/php-fpm.conf /usr/local/etc
    /usr/local/bin/php -v <= $PATH$ uses /usr/local/bin at first /usr/local/lib/php.ini
    sudo /usr/local/bin/php-fpm <= start the service
    sudo vim /etc/nginx/sites-available/default <= edit the following under server {}
    location / {
    #root   html;    
    #index  index.php index.html index.htm;
}
    location ~* \.php$ {
    #fastcgi_index   index.php;
    fastcgi_pass    127.0.0.1:9000;
    include         fastcgi_params;
    fastcgi_param   SCRIPT_FILENAME    $document_root$fastcgi_script_name;
    fastcgi_param   SCRIPT_NAME        $fastcgi_script_name;
}
    
    *Restart nginx (root /var/www/html) if root path doesn't exist, default is: /usr/share/nginx/html
    sudo nginx -t <= Test Nginx conf files
    sudo service nginx reload
    sudo service nginx stop
    sudo service nginx start <= [OK]
    
php-fpm needs to be in a service, or kill process manually ps -aux | grep php-fpm ; kill <pid>