Install Magento 2 on your webserver properly make sure you dont make an wrong start from beginning.

Step 1: Check the server requirement as per the magento version
Step 2: donwload and upload zip of magento files to server where you want to start the online shop
step 3:create database and database uer from phpmyadmin
step 4: run the magento file from browser and setup the magento as per instruction.

Using command prompt you can install magento

php -f bin/magento setup:install –base-url=http://m2.loc/2.07/github/ –backend-frontname=admin
–db-host=localhost –db-name=m2git –db-user=root –db-password=asha –admin-firstname=Magento
–admin-lastname=User –admin-email=xxx@fablogodesign.com –admin-user=admin –admin-password=magento123
–language=en_US –currency=USD –timezone=America/Chicago –use-rewrites=1