Module development and code questions

I am gaining experience with creating a custom form. I find myself in the need to create a query based on a date and other variables. Not being an expert I am doing the test with only the date.
I created the various files and in the form folder I created the test.php file, where I inserted a date field and a button

Hi,

I am trying to set the cardinality for a date field to allow the user to add multiple dates in my custom module config form (admin/config/beyondBooking). No matter what I try to put in the cardinality field ( I read that 0 means unlimited, and any other value specifies the exact number of values) I still see that the field doesn't support multiple values (I don't see "add another item" with cardinality set to 0 or multiple fields with any another cardinality value). 

Here is my code:

I'm looking for a plugin that can build a user page in Drupal and I got acquainted with the following examples but they were not very efficient, you have a better option

Lightning Talk

Thanks for your tips

Hi everyone,

I am working on a module to add optional cancellation insurance with certain products.

I would like to point out right away that I would have liked to use commerce_pado but that it seems incompatible with the bundles created by commerce_vado because you have to choose the type of "add to cart" form and they cannot be combined.

My customer wants a minor animation and I'm following the general pattern from this video but combining it with the latest library from Green Sock to create a simple text block moving up when the visitor scrolls to the copy.

Hello,

I have three date fields in a content type. In a view, I need to show results that fall between a date range for either of the three dates.

I could create three sets of exposed filters to select dates to achieve this.

Instead