How do I create a search page?
After installing the searc api module:

1) goto: /admin/config/search/search-api/index/default_index/edit

If you want for example to search for both Users &amp; Content at once, make sure that both entities for Content &amp; Users under the Data sources section are checked.

2) Goto: http://site8.dd:8083/admin/config/search/search-api/index/default_index/fields

This page is used to choose which are the fields you want to be indexed for your search.

So make sure on this page that all the fields you want to search your entities by are added to your entities; If not,
add any field using the +Add Fields button.

3) On the same page: http://site8.dd:8083/admin/config/search/search-api/index/default_index/fields

Any field you add, it has its own data type which you have also the permission to change it.

As per the data type table available at the bottom of the page:


  Fulltext fields are analyzed fields which are made available for
  fulltext search.  This data type should be used for any fields
  (usually with free text input by users)  which you want to search for
  individual words.


so in your view, if you want to use the Fulltext search to search for your contents, every indexed field on this page should also be set to Fulltext data type.

4) Goto: http://site8.dd:8083/admin/config/search/search-api/index/default_index

And make sure that the index Status bar is 100% and so all your contents are indexed to be searchable.

When you have done the above, create a new view as per below: 


Show: index default content index
Check Create page box
Display format Grid
Hit save and edit button.


Within the views configuration page:

Under add fields section:


add any fields you want and make sure the field title has the (indexed field) text.


Under the filter criteria section:


add the fulltext search field and exposed to visitors.


Here you go, visit your search page and enjoy.

If none of the above helped you, feel free to ask any other question in comments or update your current question.