you mentioned you’ve used joplin. All my notes are in markdown and I’ve been using Obsidian instead. Obsidian includes support for mermaid and can render (relatively simple) flowcharts.
https://obsidian.md/ https://mermaid.js.org/syntax/flowchart.html
The only people to know about it would be IT, if we even have an alert for it (we generally don’t) because we don’t care about someone trying to access something is blocked, we know its blocked so its no threat. Things we care about are real security concerns like when your machine suddenly is downloading a bunch of exe files, connecting to a database server in Brazil, scanning the network for open file shares and running powershell scripts to encrypt every file it finds. Most well-set-up places are running endpoint protection now though so the first thing you’ll notice is you will lose your internet. THEN you might get visited, but by then you’ll probably be calling us since nothing works LOL
Your personal security concerns are valid but every company is different, and it seems most people don’t work at a firm their whole lives anymore so there is less trust and less loyalty and decency, really. In my case the wifi given to employees for their personal phones is totally segregated from the work LAN so while it is definitely monitored and protected in the same way, its far less of a concern for company security. It is also throttled so watching videos is almost impossible, it blocks a hoard of malicious stuff (which makes using it safer for the user than when they leave), and many of those using it are on cheap limited plans so they might not be able to leave their comms open to their family or check the location of their kids during the workday, or even get updates otherwise. Many use it to stream radio stations or listen to podcasts usually into earbuds. Properly classified porn sites, etc. are blocked. However, I recently heard there will be changes imposed on us from above and all these users may soon be kicked off this wifi entirely. Managers and office workers will certainly be still allowed to use it but the people who really need it? I guess they are SOL.
The company firewall very likely is using a “content filtering” function which for Sonicwall, for example, is a subscription service where the admin can select any number of “categories” of content to block. I found lemmy.world was being blocked because Sonicwall had that domain categorized as “gaming” which was disallowed. I reported the error to Sonicwall that it should be “social media” but haven’t heard back (it takes a while) but some companies might block that category also. In short, it might not be blocked because of any positive action by your company but instead by accident because whoever first classified the site didn’t understand what it was.
Ive had a couple Nokias now (Nokia is Finnish) and find them pretty robust and both have been Android One phones so there is basically nothing on them which isn’t just stock android. Plenty fast enough for me. Note: I only buy low end phones (~$300) so YMMV
For the server I’ve used gogs for many years. It was easy to set up and has a web interface. What client you use is really up to you with git.
https://gogs.io/