Problem with controllers and routing using asp.net core

Im new to asp.net Core and i’ve stumbled upon problem with my routing/Controller. Not sure which one is faulty. Overall I don’t know how to set up multiple controllers for multiple .cshtml files which will allow me to move between pages or do simple CRUD operations. I’ve created standard Web application project. My Project schema looks like on picture before.

ASP.NET MVC – Regex to allow less than character safely

I have a ASP.NET MVC 5 app where my business users require to enter a < (less than sign). For their specific business segment the < is a common used sign. I know about the problem of XSS-Attacks, but I’m trying to find a solution to allow just the < without opening XSS-Attacks. I DON’T want to allow HTML, so I don’t what to set [AllowHtml] or disable the validation rules. They should be turned on.

ASP.NET Core storing image to SQL Server null

I am a beginner in ASP.NET Core 3.1 and i am creating this application with EF Core tutorial from Microsoft site, when i try to create a new Job and store Photo, Photo attribute says null on database, i don’t know why?
I used debugger to see if image is coming to Create method in controller and IFormFile Image parameter says it is null.

Problems implementing bootstrap-multiselect checkbox using Jquery /ASP

I have been working on this all day and have progressively backed off to the most basic sample I could find. It just appears I am not successfully implementing Jquery. Is there some simple step I am missing beyond the code? An import or reference in VS2019? As I read it, I should be able to reference everything I need with a CDN. This is a reference that I used as a sample