HOW TO GET PAYPAL SANDBOX ACCOUNT API CREDENTIALS ?

Magento2 Database is very large in size so first you don't export directly using phpmyadmin export option.

Instead You use following command for exporting database..so Follow the following steps..

1. Open shell prompt from xampp control panel
2. Goto the xampp/mysql/bin directory by cd command.
3. Write this command for export database.
   mysqldump -h hostname -u username -p password databasename > path (for downloading database)
   e.g : mysqldump -h 127.0.0.1 -u root -p markone > C:\xampp\htdocs\bhagyashri\markone.sql

Just go to htdocs folder (if XAMPP) or www folder (if wamp)then go to your project folder and compress all the files in zip format.

Write this command for importing database
mysql -h hostname -u username -p databasename < path (where your database is downloaded)
e.g : mysql -h 127.0.0.1 -u root -p markone < C:\xampp\htdocs\bhagyashri\markone.sql

Upload the zip file of Magento file that you had made in step2 After you have uploaded it, extract that files there.

In Magento 2.0, the configuration file that contains database settings and other information is located here:
/app/etc/env.php

In this file we do settings for database connections..
'db' => [
'table_prefix' => '',
'connection' => [
'default' => [
'host' => 'localhost',
'dbname' => 'markone',
'username' => 'root',
'password' => '',
'active' => '1'
]
]
],
Here we set database name, Hostname, Username and password for server.

Also change Backend Url which is by default admin.
'backend' => [
'frontName' => 'admin'
],
This allows you to define what the admin login area’s URL should be.
we recommend changing this, so that you can at least make it more difficult for attackers to not know where to go to try to find your login screen.

Install date: the date that your Magento 2.0 installation was installed.
'install' => [
'date' => 'Sat, 25 Aug 2018 04:57:13 +0000'
]

Go to your Magento database and search Table Core_Config_Data and replace your URL to your Domain name in
“web/unsecure/base_url” , “web/secure/base_url”.

May run static content deploy php bin/magento setup:static-content:deploy
Remember to clear Magento Cache and delete var/generation, var/composer_home, var/view_preprocessed.