cichy1173

In some way yes, but Docker is containerization engine, which can be used to selfhost stuff. Yunohost is special OS for selfhosting and only selfhosting. Apps installed using Yunohost are not containerized, and they are made for easy deployment.

Yunohost provides free domains (nohost.me, ynh.fr or noho.st) with Dynamic DNS, but i bought domain in Gandi. I use this simple script https://github.com/cichy1173/yunoDnsUpdater to update DNS if IP changes. I am thinking about buying fixed IP, but it is additional cost every month.

it is easy to use outside the network too. I use Yunohost for more than a 1 year

For PiHole it will be OK, but for Nextcloud or Jellyfin is too slow. It is better to buy used MiniPC/Terminal - it will be more powerful

Wallabag! I am using it for more than a year and it is great

I do not know where are you from but in Poland Dell Wyse 5070 with J5005 is really cheap and popular for selfhosting. It is really powerful (for passively cooled device) and a couple of my friends are using it for selfhosting Home Assistant

You should be concerned, because there is always a risk, but there is also a risk when you are just using internet even without selfhosting. It is good to remember some rules:

1. Keep apps up to date
2. Open only that ports, that you need (80, 443, maybe 22 for ssh)
3. If you open ssh port, use keys authentication and cut possibility logging with password
4. Do not expose apps, that you are not need in this form, for example Yunohost allows to hide apps behind Yunohost SSO logging page
5. Using cloudflare or/and Fail2Ban is cool
6. Maybe I am a little bit paranoic, but I do not expose apps, that can be used anonymously by everyone, for example link shorters or pastebin alternatives.

It is not all of course.

You should be concerned, because there is always a risk, but there is also a risk when you are just using internet even without selfhosting. It is good to remember some rules:

1. Keep apps up to date
2. Open only that ports, that you need (80, 443, maybe 22 for ssh)
3. If you open ssh port, use keys authentication and cut possibility logging with password
4. Do not expose apps, that you are not need in this form, for example Yunohost allows to hide apps behind Yunohost SSO logging page
5. Using cloudflare or/and Fail2Ban is cool
6. Maybe I am a little bit paranoic, but I do not expose apps, that can be used anonymously by everyone, for example link shorters or pastebin alternatives.

It is not all of course.

Maybe Nextcloud Collectives? If you already use Nextcloud it is simple to install, but if you don't, you need all Nextcloud instance. I use Hedgedoc but this app does not provide folders and tree structure (but has tags)

Nextcloud Deck is a really good choice and I use it, but I also know Vikunja is great

Vikunja is really cool. I used it a year ago to organise activities at university with my colleagues. I even prepared a presentation about vikunja at my university and showed it to other students.

Should be fine.