I'm going to replace my host os on my shitty laptop with Linux specifically puppy Linux or alpine Linux from scratch and I need to know how will I get started and make it easier for myself, I use a HP notebook 540
Ubuntu and fedora aren’t lightweight, I recommend Linux Mint XFCE or peppermint OS
May I ask why you, as a beginner, specifically chose one of those distros instead of more "mainstream" ones?
Puppy Linux's main use-case is to be a live ISO, that doesn't need to be installed to run. It doesn't mean it's not a good idea to install it, but I think if you want to use an Ubuntu derivative, there are better options for a beginner like Pop or Mint that would let you install a lightweight desktop environment like XFCE, LXDE, LXQt and so on.
Alpine Linux is specifically designed to avoid all the core system tools that are pretty much universal on most other distros like glibc, systemd or GNU tools and libraries, which will make your life hell as a beginner if you need to troubleshoot anything as most "universal" documentation like the Arch wiki would be at best partially relevant, at worst useless.
For starters, consider another distro if you want to make things easy on yourself. Alpine is probably a poor choice unless you have a reason to use it. I guess you could use it as a desktop if you really want to, but it’s more geared for containers and embedded devices. It uses musl instead of glibc so you will have problems running software that isn’t packaged for Alpine. The issue with Puppy is you will have a hard time getting help when you need it because it’s kind of a niche distro.
For your first time, you’re better off using something more mainstream. You are going to run into some issues and it’s a lot easier finding solutions for popular distros. Debian would be a fine choice because it’s widely used and runs great on older hardware. Beyond that, you could look at Ubuntu, Fedora, PopOS and Mint.
You can install any general purpose distro (debian, opensuse or one of that others suggested) with a lighwwight DE (LXQT, Xfce, MATE) and it will work well. However when you run a browser and open several tabs with heavy websites it will become very slow. It does not matter what distro you use. You need 8G+ of RAM for comfortable web serfing nowadays.
Different distros are better for different things. For example, some require give you more control over the OS but are more difficult to learn, or require learning more things at once. Others will be easier to try out but may make choices on your behalf that you don't like - or distribute software in ways you don't like.
Linux from Scratch will have a fairly steep learning curve. Nothing wrong with that, but you'd want to prepare yourself to be cool with things breaking or not making sense for a while.
Puppy Linux is minimalist, which is something people usually only want after they've tried out something else that's not minimalist. I would recommend trying out something more general-purpose and try out different desktop environments and applications first.
Try Zorin OS, it has cool design, and is pretty stable because it has an outdated kernel and stuff.
