Installing Drupal

I have installed Drupal 8 on my example.com website. I want to install mediawiki on a subfolder called example.com/mediawiki. When I try to access example.com/mediawiki it is giving 403 forbidden error. I guess it is because of the rules in .htaccess . How can I fix it so that only example.com/mediawiki is accessible an Mediawiki can be safely installed there? Someone suggested me deleting .htaccess file. But that exposed whole Drupal files to external threats.

My university offer their server where we can put things online using our own domain (cs1.ucc.ie/~(studentid)) It has the folder public_html but how do I install Drupal on it?
Sorry if the question is fairly basic.
Would appreciate a response!
Thanks.

Hey Drupallers! I've been out of the game for a while, and never worked with Drupal 8. Things have changed a lot.

I've got a basic site that's working fine locally in MAMP under PHP 5.6, but when I moved it to the webhost (also on 5.6), I'm getting this error in my logs when attempting to load user/login:

This could be an old issue as I have seen in Google search. I am trying to install Drupal 8.2.5 on localhost, but the installation ends up with a fatal error at the very end, while all 40 operations seem have been completed. An error message shows:

Fatal error: Maximum execution time of 30 seconds exceeded in <root folder>\core\lib\Drupal\Core\Database\Statement.php on line 59

We have a hosted site that we need to take down and archive but before we turn it off on the hosting site we have these requirements and questions....thanks in advance if someone can give me some guidance.

Hello everybody,

this is my first post and I am completely new to drupal. I have problems installing Drupal on a Windows 7 machine on Zend Server.

The installation process went well but after a while of browsing, I get:
Recoverable fatal error: Argument 1 passed to twig_init() must be an instance of Drupal\Core\Extension\Extension, array given in twig_init() (line 34 of core\themes\engines\twig\twig.engine).