all options I see seems cryptic and doesn’t make any sense, it’s maybe because I am new to Linux Kernel tinkering…

So, just as a heads-up, building a truly minimal custom kernel is going to probably involve learning about what a bunch of kernel systems do. Like, this isn't going to be a five minute task skimming a menu with twenty choices on the lines of "Ethernet", "3D graphics", etc.

I don't know what you're aiming to accomplish, but it may be that a regular kernel build already does what you want. Like, say you want to reduce memory usage. Most of the current-day Linux kernel on typical distros is built to be modular. That is, features are built into modules, and never actually loaded unless that functionality is called for. It's not all that common for a typical user to need to build a custom kernel in 2025.

You can reduce build time, but that's not usually a huge issue for most people if they're using prebuilt kernels.

You can maybe shave down disk space, but the kernel isn't usually the first candidate that I'd go after for that.

If you're doing this as a learning experience, then knock yourself out. Just want to moderate expectations, if you're going into this thinking that this is a common task and is going to involve a minimal amount of learning and effort. You're probably going to discover that your kernel requires a lot more than you're listing here to usefully function.

If you do decide to go down this route, you're going to want to dig up one of the many guides to building and installing a new kernel. If you haven't already done so, I'd get to the point that you can build a normal kernel for your distro, with the options that it sets, and get it working and boot off it. That'll give you a working starting place before you start trying to figure out what you can rip out, and you'll be familiar with the bootloader, initrd, and some other stuff that you'll want to know. You're probably going to need to understand what a lot of the systems you're stripping out of your kernel do; Google is going to be your friend.

you might have to read what all those options are about. also, what you are referring to as ethernet may or may not be a specific driver, and tty itself is a somewhat abstract concept, maybe you mean serial - which is often addressed by or attached to TTYs?