If you post a copy of your docker-compose.yml file inside a code block, somebody can probably identify the syntax error for you. Otherwise, the best I can do is tell you you can paste your YAML into https://www.yamllint.com/ and it will tell you if your YAML is valid or not.

I was thinking maybe hook them together via USB-C and use konsole for Linux dd command to duplicate over to the oled SD.

You’re on the right path, but that won’t work because the Deck isn’t a host device; you can’t just plug them into each other and see the other one’s storage media.

Also, keep in mind that if you use dd to clone one disk on to another, you’re also cloning the partition table from the original disk. If the target disk is larger, you’ll also have to first expand the partition to fill the whole disk, then also expand the filesystem to fill the partition.

I can tell you what I’d do, but I only use Linux on my desktop computer; there are probably similar Windows tools for doing this, but I’m not familiar with them.

First, assuming you have a computer with an empty NVMe slot or a USB NVMe drive reader and a hard drive that has enough space to hold an image of the original disk:

1. Plug the source disk into your computer, dd to dump the original disk
2. Remove it, plug in the target disk, use dd to copy the image to the target disk
3. Use gparted to resize the partition to fill the new disk
4. Use resize2fs to resize the filesystem to fill the entire partition

After doing that, you can put the target disk back in the Deck and it will probably work, but no guarantees since I’ve never tried it.

For one, I’ve found following Feditips to be very useful; they give a lot of good advice on how to use the Fediverse and find other people. They are a bit Mastodon-specific – which is fine if you’re actually using Mastodon, of course – but a lot of their advice applies to other Fediverse instances like Firefish or Akkoma, too.

The general advice I’d give is:

• Use hashtags! Put hashtags in any post you want other people to be able to find, and find out what hashtags are popular for whatever kind of content you like, then search for them regularly.
• Many people start by making an account on mastodon.social first because they’re the largest instance, but it’s easier to find people with similar interests if you join an instance focused around that; then, you can look at the local timeline to find people talking about things you like.
• If you know a lot of people on Twitter, you can use Fedifinder to try to find any of them who have Fediverse accounts.

Probably the easiest way to get a word processor on the Deck is to install LibreOffice via flatpak (https://www.libreoffice.org/download/flatpak/). It should take up about 700 MB when installed, up to you whether that’s too much or not.

It’ll probably work pretty well for your needs, but unless you already have one that works, do some research before buying a portable monitor to make sure you get one that will work with the Deck. A lot of small / portable monitors that use USB connections rather than HDMI require proprietary drivers that will not work on the Deck.

If I’m on a server and I post something and someone (who is from other server) comments on my post does rules of server where I am apply to that comment?

This kind of depeneds on the admins & moderators of the servers in question. Some servers are very strict and will defederate from other servers that break their rules (mastodon.art is notorious for this); other servers are more lax and will turn a blind eye as long as there aren’t egregious violations.

Is it easy to change servers if I will have to?

Yes, migrating accounts between servers is a standard part of ActivityPub, and it’s easy to move your followed accounts and followers to a new instance, and your old account will automatically forward people to your new one. The catch is that Mastodon doesn’t support migrating posts, so your old posts will still only exist on your old account. It’s worth noting that Firefish, a Fediverse platform that can communicate with but is different from Mastodon, does support importing posts from Mastodon servers when migrating.

Most of the big Fediverse servers are pretty LGBTQ-friendly and left-leaning, and overt LGBTQphobia and harassment tend to get banned quickly. You can view a list of categorized servers that are open to new registrations here: https://joinmastodon.org/servers

If you’re not already dedicated specifically to Mastodon, also check out Firefish servers here: https://joinfirefish.org/join

I’ll just suggest that I would probably not recommend joining mastodon.social. It’s by far the largest server, and as a result is having some performance issues; it also has somewhat more lax rules than most servers, and they can get away with it purely because they’re the largest server, so you’ll probably find a more welcoming community on a smaller one. Maybe tech.lgbt or lgbtqia.space? Also maybe pawb.fun or stop.voring.me if you like furries.