New WordPress Website in Linux Ubuntu:

unzip wordpress-4.x-nl_NL-rootfiles.zip -d /var/www/mynewsite
cd /var/www/mynewsite
find . -type d -exec chmod 0755 {} \;
find . -type f -exec chmod 0644 {} \;
cd ..
chown -R www-data:www-data mynewsite

mysql -u root -p
create database mynewsitedb
GRANT ALL PRIVILEGES on mynewsitedb.* TO MyDBUsername@'%' identified by 'MyPassword';

create /etc/apache2/sites-available/mynewsite.conf
a2ensite mynewsite ( a2ensite = apache2 enable site )
service apache2 reload

Content mynewsite.conf:
________________________________________________________________________________
<VirtualHost *:80>
DocumentRoot /var/www/mynewsite
ServerName mynewsite.com
</VirtualHost>
________________________________________________________________________________

Handige Plugins:

TinyMCE Advanced --> Enables advanced features and plugins in TinyMCE, the visual editor in WordPress
Anti-spam --> No spam in comments. No captcha
Contact Form 7 --> Gewoon nog een contactformulier plugin. Simpel maar flexibel
Contact Form 7 Designer --> Contact Form 7 Designer is an add-on for Contact Form 7 that allows you to add custom designs for your contact form, without requiring any coding knowledge. (requires: Redux Framework)
Contact Form 7 Datepicker --> Easily add a date field using jQuery UI's datepicker to your CF7 forms. This plugin depends on Contact Form 7
Download Manager --> Manage, Protect and Track File Downloads from your WordPress site
Meta Slider --> Easy to use slideshow plugin. Create SEO optimised responsive slideshows with Nivo Slider, Flex Slider, Coin Slider and Responsive Slides
NextCellent Gallery --> A Photo Gallery for WordPress providing NextGEN legacy compatibility from version 1.9.13
Really Simple CAPTCHA --> Really Simple CAPTCHA is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin.
WP User Frontend --> Create, edit, delete, manages your post, pages or custom post types from frontend. Create registration forms, frontend profile and more...
Yoast SEO --> De eerste echte alles-in-één SEO-oplossing voor WordPress, inclusief analyse per pagina, XML-sitemaps en veel meer.
WP Statistics --> Volledige statistieken voor uw WordPress site
Configure SMTP --> Configure SMTP mailing in WordPress, including support for sending e-mail via SSL/TLS (such as GMail).
WooSidebars --> Replace widget areas in your theme for specific pages, archives and other sections of WordPress.
Optimize Database after Deleting Revisions --> Optimizes the WordPress Database after Cleaning it out
Alles-in-één SEO Pakket --> Out-of-the-box SEO voor jouw WordPress blog. Features zoals XML Sitemaps
PS Auto Sitemap --> Auto generator of a customizable and designed sitemap page.

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error message:
English
Temporarily unavailable due to scheduled maintenance. Please try again in a few minutes.

Dutch:
Tijdelijk niet beschikbaar vanwege gepland onderhoud. Probeer het over enkele minuten nog een keer.

Solution:
delete the file ".maintenance" in the root of the site's web folder