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I primarily use Standard Notes. It’s a fantastic tool and I can use it anywhere, online or offline. It’s not great for collaboration, though, and it doesn’t have a canvas option. But I use it for scratch pads, for todo lists, for project tracking, for ideas, plans, plotting for my tabletop (Monster of the Week) game, software design and architecture, for drafting comments, etc…
Standard Notes also has a ton of options for automated backups. I get a daily email with a backup of my notes; I can host my notes on my home server and the corporate one; I can also set up automated backups on any desktop.
I don’t use it for saving links. I’m still using Raindrop.io for that, even though I’m self-hosting both Linkding and Linkwarden.
For sharing and collaboration, I either publish to Listed with Standard Notes or use Hedgedoc, which is great for collaboration and does a great job presenting nodes, too.
For canvas notes, I use GoodNotes on a tablet or the Onyx Boox’s default Notes app. I’d love a better FOSS, self-hosted option, especially for the Boox, but my experiences thus far have been negative (especially on the Boox).
I’ve been trying out SilverBullet lately, since I want to try out cross-note querying and all that, but I’m too stuck in my habits and keep going back to Standard Notes. I think I’ll have better luck if I choose one app and go with it.
I also have a collection of Mnemosyne notebooks that I use with fountain pens (mostly the Lamy 2000, but also quite commonly a Platinum 3776 or a Twsbi). Side note: the Lamy 2000 was my first fountain pen and after getting it I went deep into fountain pens. I explored a ton of different options, found a lot of nice pens across a number of brands… and yet how I still haven’t found something that I consistently like more. The Pilot VP is great but deceptive; a fancy clicky pen that only holds 30 minutes of ink (in a converter, at least) is decidedly inconvenient.
I’ve also been checking out Obsidian on my work computer. So far I haven’t seen anything that makes me prefer it over my existing set of tools.
A paid skillful engineer, who doesn’t think it’s important to make that sort of a change and who knows how the system works, will know that, if success is judged solely by “does it work?” then the effort is doomed for failure. Such an engineer will push to have the requirements written clearly and explicitly - “how does it function?” rather than “what are the results?” - which means that unless the person writing the requirements actually understands the solution, said solution will end up having its requirements written such that even if it’s defeated instantly, it will count as a success. It met the specifications, after all.