why i am not able to paste anything in htdocs folder in ubuntu code example

Example 1: Sorry, I don't know how to bootstrap Certbot on your operating system!

I was having trouble with this as well since Amazon Linux 2 doesn't have epel-release in its repositories, but I've found you can install the EPEL RPM package itself, and then you'll be able to install certbot or certbot-nginx from there.

Download the RPM

curl -O http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
Then install it

sudo yum install epel-release-latest-7.noarch.rpm
Now you can install certbot

sudo yum install certbot
And then run it as usual

sudo certbot
Check out the certbot page for configuration details after that.

Example 2: why i am not able to paste anything in htdocs folder in ubuntu

sudo chown yoggesh:yoggesh /opt/lampp/htdocs
sudo chmod 777 /opt/lampp/htdocs

Example 3: what Permissions do I need for include folder on php

Directories must have execute permissions to be usable;
Usually this is 0755.
PHP scripts run via mod_php are not executed but rather read;
0644 will suffice for this.

Example 4: image not shoing when i use network image,flutter

Try to add internet permission in android folder(do nothing with IOS part). Or jsut reinstall app.

Example 5: can't see php7 in my mac

// Install PHP 7.3
curl -s http://php-osx.liip.ch/install.sh | bash -s 7.3