Welcome to Discourse!
One thing I finally did yesterday was create an ‘empty’ TW entitled davesfaves with all of the many system tiddlers I tend to use in all of my TW files: stylesheets, editortoolbarbuttons, sidebar tabs, viewtemplate, macros, others’ plugins, you name it. I tagged each one $:/davesfaves and added <<tag “$:/davesfaves”>> to a sidebar tab and uploaded the file to my site.
That way I can either download the file as an ‘empty’, or drag the tag pill into an existing file. This will save me time when creating new files.
I know none of you would add the tag pill to your files, as your tastes will no doubt be quite different from mine, and there may be incompatibilities. But feel free to browse the tag pill’s contents (see it here), to see what kinds of things I included, in case you decide to do something similar. And also to grab individual items you find helpful. Or you can download the file, or play with its editor toolbar buttons. etc. Enjoy!