I download magento 2 and extract it in xampp/ htdocs/ magento.
I created a database using phpmyadmin.
But when I open my browser and write localhost/magento it shown error 404 not found.
After downloading and unzipping in the directory have you done the commands to install Magento?
If you have done all the settings and still have the same error you can refer to this article for more information.
Hope this can help you! Let me know if you need further assistance.
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For Linux edit the file /etc/apache2/apache2.conf
To edit this file use sudo vi /etc/apache2/apache2.conf command
<Directory /var/www/> Options Indexes FollowSymLinks AllowOverride None Require all granted </Directory>
<Directory /var/www/> Options Indexes FollowSymLinks AllowOverride All Require all granted </Directory>
After this run command
sudo service apache2 restart
IF STILL ADMIN SHOW 404 NOT FOUND, FOLLOW THIS STEP
1) Add .htaccess at root of magento 2
2) Now run this command
php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy
rm -rf var/cache/*
rm -rf var/generation/*