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Well for a Beginner I always prefer Wordpress because of its simplicity and tons of plugins which help in Easy formatting and setting up the Website. Other options are joomla and Drupal for which you...

You can use 301 redirect in .htaccess, so google do not find any dead link.
Use the below mentioned code for redirection:

Redirect 301 /en/php/project.html http://www.example.org/newpage.html
...

Wordpress is best choice for website designing because every theme have its own documentation with help these you can easily made change or customization in you website.

Start with learning basic of HTML and CSS (Online tutorial at w3schools)

If you want to add an download link in wordpress, it very easy just add ss after www. in video link embed from youtube.
for example www.youtube.com/watch?v=auqyXFLZ_zw add download link...

I am Stephen Chong from Singapore. I have been working in web designing from last 5 years. I am to learning more about web design.