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first, a few advices:
1) BE CAREFUL WITH ANY OPTION CONTAINING THE WORD "REPLACE", as it REPLACES BULK
2) "Find" options, better the more detailed thing to find

how to...

...create a node with multiple lines in title?
when asking for your new node name, insert "<br>" (without quotes) wherever you want to split the title
Example:
1<br>2

You can change the title name and make it multi/sigle line in "Tree" -> "Node Properties" -> Node name

...create a node with key combination?
1) CTRL + ALT + n

...launch a find with key combination?
1) CTRL + SHIFT + f

...save locally my data?
1) unselect any node you may have selected
2) "File" -> "Save" OR click de blue disk icon (fourth from the left)

...move a node up (or down)?
1) select the node you want to move
2) CTRL + SHIFT + ARROW UP (or ARROW DOWN) (can be done through "Tree" -> "Node Up" and "Tree" -> "Node Down", but is slower)

...move a node to another parent?
1) select the node you want to be the new parent
2) "Tree" -> "Node/Tree Info" will show a popup with "Node ID: xxxx"
3) Copy the number (Firefox, SeaMonkey with CTRL+C, Vivaldi must be done manually)
4) select the node you want to move
5) "Tree" -> "Change Parent Node"
6) Put the previous noted ID and click OK
7) done, save if you want to preserve the change

...edit a node? (edit mode)
1) left panel, click on node you want to edit
2) click on the icon with a tree and a pencil (node top-right)
3) write on the right panel
4) click on the icon with a tree and a pencil (node top-right)
5) save when done

...edit a node but changed my mind?
1) left panel, click on node you want to edit
2) click on the icon with a tree and a pencil (node top-right)
3) write on the right panel
4) instead clicking on the icon, simply unselect the node or click on another node

...work with checkboxes?
this one is tricky...
1) edit your node, add the checkboxes you may need
2) exit edit mode
3) set the value (checked or not) for your checkboxes
4) enter edit mode
5) exit edit mode
6) save to preserve your changes

...stop inserting bulleted/numbered items?
1) empty item + enter will exit

...change color in sketchpad?
1) it's not possible yet

...change icon in node at the left panel?
1) "Tree" -> "Node Properties"
2) click on the icon at the right of "Icon:"
3) select you new image, it will be scaled and embedded inside, so be careful with size (both, geometry and bytes)
4) click OK
5) save to preserve your change

... make a "box" resizable? (dirty method, i know)
1)if you look at "Tree" -> "Change Node Properties" on a node you just created, you'll see something like...
""
2)change the "" part to something like that...
"<style><br> <a class="alink notfound" href="draggable%3Dtrue">[draggable=true]</a> {<br> cursor: move;<br> }<br> .resizable {<br> overflow: scroll;<br> resize: both;<br> max-width: 300px;<br> max-height: 460px;<br> border: 1px solid black;<br> min-width: 50px;<br> min-height: 50px;<br> background-color: skyblue;<br> }<br> </style>"
(background color changed too, max size set to 300x460, play with params to view how those affect)
3) insert the box, set the size you want (lower-right corner), find your div and put this 'draggable="true" class="resizable"' between 'div' and 'style' (omit single quotes)
4) enter edit mode for the node
5) exit edit node for the node
6) save the document

...and an easier method?
1)if you look at "Tree" -> "Change Node Properties" on a node you just created, you'll see something like...
""
2) insert your box
3) look for your div at "Tree" -> "Change Node Properties"
4) add this to its style: "resize: both;"
5) enter edit mode for the node
6) exit edit node for the node
7) save the document

...but wait... as far as I know, you're making me edit HTML & CSS... does it means I can author my page elsewhere and then, put it here?
1) probably, the easier (less complex, less external libraries, less frameworks) the better for doing it, I'm doing it until the editor is finished, sometimes leads to file corruption, so do it with care. I wouldn't recommend a word processor for that ("export to HTML" for example) because the amount of trash is huge,
use something like "https://html-online.com/editor/" instead or KompoZer (must be downloaded from portableapps.com, look for it here https://portableapps.com/apps/development) and replace your "<body></body>" with the one generated by the editor.

...use advanced and hidden features?
...yes, x-whnb has some advanced and hidden features accesible to the (advanced too) user, but i'll explain them later... ;)