Hi, I'll leave this message up for a while in case it's a genuine request for advice (I'd be willing to offer some myself as well), but this is a Tabletop Roleplaying Games Forum, which means it is concerned mainly with NON-digital roleplaying and storytelling games. Coding isn't usually a relevant topic here, since most of these games are presented in book / pdf format and do not require coding skills to produce.
Anyway, I dabble a bit in coding and game development, but am far from an expert. That said, there are SO many tutorials online, including some that start with the most basic of basics, that you shouldn't have too much trouble learning these skills if you just trawl around youtube for a while.
I have never heard of a language called Scratch - unless you meant "from scratch" which is just an expression that means to make something from raw ingredients, so to speak. Similarly, I don't think chrome is a language? A Chromebook is probably fine for learning, but I am not sure how much flexibility it'll give you. It's runs a fairly stripped down operating system, so you're going to need to do some research on how to best set up a working coding environment on there.
If you are restricted to a Chromebook, your simplest bet to start making games quickly is probably Twine, which lets you work directly in your browser and saves your projects in your browser as well (just don't delete your history before exporting). It may not seem like much, but it's quite accessible, can be used to make interesting things (you're mostly going to be restricted to choose-your-own adventure and visual novel type stuff, but I have hacked it in the past to do very retro roleplaying and dungeon crawling games). It can also be a good way to start learning to code while also seeing some results right away, since you can begin , by simply stringing passages together using a visual interface and very basic markup, but then slowly start looking up more advanced things as you need them. The concepts you can learn this way will usually apply to coding in general - conditional statements, variables, and so on.
If you want to get more advanced and more flexible, Python is an excellent language to start learning and does, I believe, work with Chromebooks after a bit of extra installation work. Just google "Python and Pygame on Chromebook" and some resources / instructions should pop up for you. Pygame is not widely used, but has a community of its own, and has even been used to make a handful of commercial games. It can be used to make a variety of 2D games - literally any 2D genre you want. It is, however, a completely "from scratch" process. It will not give you any kind of drag-and-drop functionality and you will need to code almost everything from the ground up.
I also believe that the most recent versions of Unity may actually run on Chromebook, if you want more of an "engine" experience. The advantage here is there are a lot of plugins and resources out there, tons of free learning materials (as it is one of the most widely used game engines in the world right now), the ability to set up your scenes visually, and the fact that it can be used for both 2d and 3d games, and even VR. The two big drawbacks is that it can be tough to run on lower end computers (so you'll probably need a nicer / newer chromebook to run it well), does not have a totally open license (it's free to use and sell your games on PC, but you will have to pay if you want to port them to consoles and such), and has its own learning curve issues, in that you won't only be having to learn coding but also the specific quirks and methods of Unity itself.
Anyways, good luck. Hope this helps a bit. My final word of advice is start small. I KNOW that what you're planning to do is a massive open world RPG game with tons of features and a custom physics engine that will make you a millionaire - but that's just not going to happen. Start with pong then slowly progress from there. You will not be making the next Skyrim, or even the next Stardew Valley, any time soon. Get creative with your limitations and you will grow faster.