Drupal 8.x

I have been away from Drupal installs for a while and need a reminder on what I use rather than localhost when installing.  The default host is localhost, but there is an Advanced tab.  What do I use in place of localhost?

I am working on sidebar menu in a Custom Drupal 8 Theme. I am trying to set a class of sidebar__menu--submenu-1,sidebar__menu--submenu-2, sidebar__menu--submenu-3 and so on depending on the level of the submenus.

So far, I was able to add the class sidebar__menu to the first level & sidebar__menu--submenu to all the submenus. However, I want to add the class sidebar__menu--submenu-(number of the level) so I can style & control the sidebar better on css.

Any help will be really appreciate it!

Here it is my code menu.html.twig:

Hello Friends,

I have a simple form named BusinessListingSearchForm.php that looks as follows:

Hello everyone,

After updating drupal core to v8.6.10 (highly critical security release: https://www.drupal.org/sa-core-2019-003) an issue with commerce log - order activity occurred.

Hello. First of all, sorry for my english, i am not really pro with languages. 

I am building a custom module. At this point i did a page, a form and can send it to database. Now i need build another page for update the data inserted in last form. I dont want to build another module, and i suposse there are other ways to do it on same module. 

Some help/guide would be great. Thank you.

I have this code on routing.yml: