html: What technologies should I learn to create a website with a multi-selection drop-down menu dynamically filled in with automatic saving?

I am new to web development. I hope to be in the right stack exchange. I just understood the forms, DOM, main uses of HTML, CSS and Javascript. That said, here is my requirement. Let's say I have a website that has several multi-selection drop-down menus.

  1. Car brand: This multi-selection drop-down menu would be completed from the options in a database such as AWS DynamoDB (I know that the query syntax is different). Something like SELECT * FROM carmaker; The rows of all these queries should appear as options in Car brand Multiple selection drop down.

  2. Car name: When selecting options in Car Make, the next multi-selection drop-down menu is Car Name, where all the tables that were Car Make options will be consulted. If I have selected two options of Car brand multiple selection drop down then Car name the multiple selection options would be SELECT * FROM option1, option2, option3 etc.

There are no submit buttons in any of these multiple selection drop-down menus. As I select all options, the following drop-down menu should be filled in properly. There should also be this automatic save option where the page will remember the chosen option

Things I can use: any AWS service for databases, asynchronous calls, call services, React.js, Bootstrap.

I would just like to know what I should look for in Google:

  1. Dynamic multi-selection selection options that are filled when querying a database without a Submit button.
  2. Autosave feature.

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In its default configuration, the uMatrix content blocker allows CSS and images (JPG, PNG, etc.) from all sources, unless rejected by a site-specific blocking list. It also allows first-party cookies, scripts and multimedia.

How much can a third party learn about a visitor to the site through only CSS and images? Suppose that it is an updated browser that meets the standards and is about: the visited state.

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How to learn effective web design?

Good afternoon!

So I am a guy who has wanted to learn how to build GOOD websites for most of his life. It seems that I never get very far with that, or I get lost in all the different books, websites and opinions there are, I get bored with the 100 pages read and then I do 10 minutes of real design work or life happens and I have to focus in other things.

I recently got a couple of Amazon e-books, HTML5 and CCS for Dummies and Unraveling HTML5, CSS3 and JavaScript and I've been reviewing some of them. Both are older books and seem to be outdated with what I see on the web today, and both have completely different ideas about almost everything.

I'm looking for a cheap source (or free) to learn web design, and learn it the right way the first time, is that less a textbook and more of maybe a project? I'm not sure how to best describe that.

I do it better with my hands, of course, explaining how the hands work is also important.

Any advice would be greatly appreciated!