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Step 1. Just put the extension files under the app/code folder and the folder structure would be app/code/extension_name.
Step 2. Now Clear all the cache from the SSH by using the command below:
sudo rm -rf var/di/* var/generation/* var/cache/* var/page_cache/* var/view_preprocessed/* var/composer_home/cache/*
Step 3. After this execute the upgrade command below:
sudo php bin/magento setup:upgrade
Step 4. Now provide the 777 permission to the var and pub folders as the command given below
sudo chmod 777 var* -R sudo chmod 777 pub* -R
Step 5. Now Deploy the magento 2 code by using the command below:
sudo php bin/magento setup:static-content:deploy
Step 6. Now again provide the 777 permission to the var and pub folders
sudo chmod 777 var* -R sudo chmod 777 pub* -R
Step 7. Now Check the file config.php in the app/etc/config.php and you will see your extension will be listed here just like as the image given below:
Step 8. Also you can check is the extension installed or not, check the setup_module table and your extension will be listed here in this table
Step 9. Check the admin and you will see that the extension is installed successfully.
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