Webfaden

I wouldn’t recommend to delete <?php wp_head() ?>. Some plugins use it to get code into your header, so some things might not work. You should move it right before the </head> tag though! It’s also important to have the <?php wp_footer(); ?> right before the </body> tag.

Maybe it helps to just move the we_head, because it caused myself some trouble when I had it in the wrong position and not right before the head closing tag.

Hope it helps!

If you’ve just set up the page it’s very usual that google needs some time. That could be up to some weeks. In any case, you can use this google webmaster tool to let google know your site exists, so they can crawl the URL and put your sites into their Index:
https://www.google.com/addurl

Like the person above said: You simply change the_content() on index.php or where the content from your front page is and change it to the_excerpt(). And on your single.php you can use the_content(), so if you click “read more” you will get the full content. You can chance a few excerpt settings via functions.php – It’s all very well explained here:
https://codex.www.ads-software.com/Function_Reference/the_excerpt

Good luck ??

Sometimes there’s also the simple option to increase your memory limit yourself if you log in to your hosting account and view your server options. But sure enough whether or not you can choose those values yourself depends on your host.