Text editors I use
Mousepad
Leafpad
Sublime
Atom
Mousepad pretty basic with no syntax highlighting but as you say, they will open and edit most anything. I think it’s funny that you don’t even have to give a text file an extension. Of course if you want to be able to open it in windows, you have to add .txt to it. Mousepad does have line numbers.
Leafpad has line numbers, themes, syntax highlighting etc.
Technically, I have one more text editor I just installed. It’s a terminal text editor called markdown. You type “markdown” in the terminal and it starts in the terminal, Type some markdowm, hit enter and it gives you back html. Not what I was thinking it was.
For my Nextcloud, I just found PicoCMS can be integrated. You end up wuth a cruddy looking url though. example.com/cloud/index.php/apps/cms_pico/pico/blog — which doesn’t work for me.
Yukuake is a pretty cool terminal app. Set it to autostart and when you hit F12 and it drops down from the top of the screen.
If you build websites, you’re probably familiar with google’s webP image format. Insanely small file size. Gwenview is a Gnome app for viewing, resizing, cropping images and you can save them in other formats, including webP. Even when you crop and/or resize and save in the same file format, they come out pretty small in file size.
Inkscape is a vector graphic editor that saves as svg or exports as png and the png will be tiny in file size.
GIMP for photos aka jpg/jpeg.
Falkon is a fairly new web browser made by KDE. It’s yet another Chromium based browser, similar to Brave but not a whole lot of features. Fast though.
Oh yes... Inkscape is my go to for image adjustments. As for line numbers I only pay attention to those if it is the first time I am editing that file and someone actually shared the lione number. So many directions are “find this” with a couple lines of code to look for and do not give line numbers anyhow. And once you have edited the same file a few times those line numbers change anyhow. :)
So the default “text editor”in this Mint works fine, and it does highlight in different colors as to functions. That helps a LOT... the “find this” reference is a serious burr under the saddle of anyone who does web work... “Finding that” is not always as easy as they make it sound. lol