Theme development

I am trying to customize a responsive grid view in D8 using Bootstrap Grid. Code is working, but I am trying to find out if some extra divs can be removed.  

Currently I am getting

I am trying to port my Drupal 7 theme to Drupal 8. However, I am encountering the following error: 

User error: "name" is an invalid render array key. in Drupal\Core\Render\Element::children() (line 97 of /opt/drupal8.10/core/lib/Drupal/Core/Render/Element.php)

Note: I also encounter this error with the key 'title'

I have done the following during the process of converting my theme:

I am trying to port a Drupal 7 theme to version 8.7.10. I am currently encountering the following error:

User error: "name" is an invalid render array key. in Drupal\Core\Render\Element::children() (line 97 of /opt/drupal8.10/core/lib/Drupal/Core/Render/Element.php)

In the process of converting my theme, I have done the following:

- I copied over my drupal 7 theme to the 'themes/custom/' directory under my drupal 8 project root

I've been away from Drupal for several years as I worked with WordPress on a small news site. When I returned to test Drupal, I realized my knowdge of designing a custom frontpage needed help. I've read differing opinions about whether to go with Views or code. What is the best way to construct custom views and bring them together?

Thanks.

I have a theme with Bootstrap 3 and I created a code to close the menu when I click outside.

In this menu, I have an ui-autocomplete field. The problem is that when I select a result in the ui-autocomplete list, the menu closes. I want it to stay open.

https://i.stack.imgur.com/F0ZAa.png

Hi, 

The front page of my website looks something like this:

https://imgur.com/a/0VInLMA

Each of the links is a content type.

I want to click the links (displayed on the block on the left hand-side) and open a block that displays some information (other links) related to the content type.

How can I open another block by clicking a link on the existing block?

Something like this:

https://imgur.com/a/7xtkKsg