Hello,

1. Put main menu exactly like this just after search bar -> https://vapegirl.nl (i want the header to look like this)

Navigate to Woodmart > Header builder http://prntscr.com/iyd2pe

Choose the proper header type (your current) http://prntscr.com/iyd333

Add the elements as per your needs: http://prntscr.com/iyd3h3 and https://xtemos.com/docs/woodmart/header-builder/add-edit-builder-elements/

2. Slider height to be like this (https://www.macoque.com) and reduce slider height on mobile too

Please refer the Slider Revolution documentation in order to configure the Slider as per your needs https://www.themepunch.com/support-center/

3. Hide “shop” and “produit” in links and breadcrumbs. We want simple thing like

Check the available options in the Dashboard > Settings > Permalinks.

4. We want the 2nd tab of Mobile menu “CATEGORIES” have the Actual Main Menu on website

The mobile menu is created and assigned in Appearance > Menu > Select menu and displayed by means of Mobile menu element in the Header Builder in the Mobile view. https://xtemos.com/docs/woodmart/header-builder/header-responsive-settings/ One and the same menu can be both Main and Mobile. Mobile menu element has the option to show Category menu. You can select any from your site.

5. Hide available stock quantity on the single product page (we don’t want to show our stock quantity to customers for the moment)

You need to disable stock management in Woocommerce > Settings > Product tab

6. We want our Checkout forms to be as simple as this with only those fields

Our theme does not have any options, you will have to find a plugin

Best Regards