Shift enter for single line break.
Preserve formatting: copy and paste into the middle of a sentence or paragraph. (Note: sometimes formatting will be inadvertently copied in from source.)
Update button upper right.
To change captions in slide shows:
1) Media Library/Gallery, alter caption (alt tag not as important to alter).
2) Might have to go into MetaSlider, re-save the particular slideshow.
Drag and drop order of slides.
Add slide (near top).
If you add another pic or two to the About MetaSlider, you should turn on the arrows and dots in the right column. I left them off while only one pic.
If using an image in two places with different shapes, may want to upload again if desired result is not achieved in both places.
Edit/crop: if something you want to remove from pic, or to shape for sliders at 1334 x 750. See instructions on my website, https://www.madriverweb.com/client-pages/wordpress-basic-documentation/#images.
This page may also be helpful, https://www.madriverweb.com/client-pages/wordpress-basic-documentation-blocks/.