After Installing NextCloud on your server

 After Installing NextCloud on your server  you will got these security and warning issues 

1)  Your installation has no default phone region set. This is required to validate phone numbers in the profile settings without a country code. To allow numbers without a country code, please add "default_phone_region" with the respective ISO 3166-1 code ↗ of the region to your config file.  

Solution :'default_phone_region' => 'US',   

Add this line in config/config.php  file 

2)   No memory cache has been configured. To enhance performance, please configure a memcache, if available. Further information can be found in the documentation ↗.

Solution : 'memcache.local' => '\OC\Memcache\APCu',

Add this line in config/config.php  file 

Go to your cPanel >>> Software >> PHP Version >> Options >>  enable these modules 

A) Redis

B) Memchace

C) Apcu

Some  issues Sould be Solve