Dave-in-Decatur

Hi, and welcome to the forums. As @lost_gweedo says, the Web clipper creates a new note in the notebook you designate, so in your case the notebook with the title of your book. You can't clip directly to an existing note, nor, as you've discovered, simply drag one note from the list into another note. What you can do is merge multiple notes together: click on your notebook in the sidebar on the left, then first select the chapter note, then use Ctrl+click to select the Web-clipped notes in the order in which you want them to appear. As you select notes, a popup dialogue bar will appear. When you've got all the notes selected, click the "Merge" icon  on this bar. This will open a dialogue with various options. I said you should select the chapter note first, but in fact if you don't, you can rearrange the sequence of notes in the dialogue; whichever one is first in the list will give its title to the new, merged note. The "Advanced options" dropdown will let you choose some specifics of how the new note will appear, and whether to retain the original notes or have them moved to Trash (where you can still access them later until you delete them).
Another option is to select and drag content from within a Web-clipped note into the main chapter note. One way to do that would be to open the main note in a separate window (double-click on it, or press Ctrl+Enter while it has focus in the note list), then select each clipped note in sequence, select all its content, and drag it to the new note. This could get a little tricky, though, depending on the complexity of the Web clips, and I would stick with merging.
One final thought on structuring your notes. I also have notebooks for books to be written, and individual notes for specific research, ideas, etc. I haven't yet organized these notes into chapters, but if I decide to do that in Evernote rather than in my writing software, I will probably use a tagging system such as @lost_gweedo suggests. Then when I view a specific chapter's tag, I will see all the notes that pertain to it. The added advantage of this is that if you're not sure which chapter some material might belong in, you can put multiple tags on it and decide later. Such a system will keep your chapter notes from becoming too long and unwieldy. Evernote is designed to work best with relatively short notes.
Hope all this is some help!

I've got the same version of the Web client, and I can't reproduce this, either there or in the Windows desktop client. Are you seeing this consistently? What operating system and browser are you using?

I also have v. 10.41.5. I just tested, following the same procedure as in your video (which displays OK on my Windows 10 laptop), and was able to create 2 new notes successfully. Since this seems to be an isolated problem (unless indeed a search of the forums turns up other reports), it's most likely a local issue. You could try uninstalling (using Revo Uninstaller, since Windows doesn't always seem to completely uninstall Evernote). Or else try removing your local database: Go to File > Sign Out; in the "Keep local backup?" dialogue, select "Remove my Evernote data from this device," then sign out; restart the computer; start Evernote, sign in, and wait for your notes to sync. After a couple of minutes (should be enough to start with), try creating a new note and see if it works.

Hi, @dornote, and welcome to the forums. Are you using Evernote 10? On Windows, Mac, Android, Web version...? Previously Evernote would create a Conflicting Changes notebook and deposit the conflicting note there. These days, at least in the Web version, it will pop up a notice that a duplicate copy has been found and offer to take you to it. I haven't experienced this in the v. 10 Windows desktop app, so I can't speak to that.
But, to be clear, do you mean simply duplicate notes, or notes that have been edited on more than one device and end up with different versions of their content?

@ruralrelic, I often find this in notes created by clipping from the Web, or sometimes from emailing into Evernote. Using Evernote in a Web browser, the material shows up surrounded by a gray box labeled "HTML content". Is that what you're seeing? If so, try clicking on the top gray bar of the box. That should bring up a "magic wand" icon that lets you convert the material to editable text. Hope this helps!

Try the blue button (Insert) at top right. I find that it can insert a checkbox into the middle of a sentence.

Regrettably, there doesn't seem to be such a possibility yet. The one workaround I can think of is to use a Bluetooth keyboard with a page down or Ctrl+End function.

Hi, and welcome to the forums. In the Evernote Windows program, go to the Tools menu, then Options, then Shortcut keys.

Finally found the other report, scrolling down in the update release thread:
 

On my phone (a Samsung Note8 running Android 9), I can go to Settings > Apps, and then when the long list of apps has loaded, I can tap the 3-dots menu in the top right corner and select Default apps. That brings up a short list of apps that have been set as default for something. There are various categories there, and under each category that has a default app set I can tap it and change the default app. If what I'm looking for is not in that list, I can tap a link at the bottom, "Set as default," and that will bring up the whole list of apps again, this time with each app marked with either "Set as default" or "None set as default." For apps marked "Set as default," tapping them brings up a screen with the information "This app is set to open by default for some actions," and a button "Clear defaults." Tap that button, and the app is no longer set as default for anything. Frankly, this seems like an extremely crude way to manage defaults, but it's what Google/Android has chosen to do. I hope this will be some help.

A long-standing feature, not a bug. For further reading, see the also long-standing request that it be removed or made optional:
In particular, this explanation from Evernote staff:
 

Welcome to the forums! We are mostly other Evernote users here, not Evernote staff or development team. If you're talking about the evernote.com home page I tend to agree that it is heavily loaded with marketing, and does not offer much help for people who already have Evernote accounts. The Download App link is way down at the bottom of the page. It could certainly be featured more prominently.

Please see the recent discussions in these threads in the Android technical issues forum:
 
 

Hi, @jimmyray, and welcome to Evernote and to the forums! Yes, this is done by adding an attachment to the particular note, using the paper clip icon on the top toolbar. Tap that while you're editing the note, and Photo will be one of the options. The dialog to choose the photo, at least on Android 8, kind of reeks, but it does work. Also, to the right of the paper clip will be an icon representing the most recently used attachment type, so if you have a bunch of photos to add to a note or notes, tapping that each time will take you directly to the photo dialog.

UPDATE: I just installed v. 7.9.4, now available in Google Play. This adds the capability of adding a quick note from the Android notification bar (In the Evernote app, Settings > Notifications > Add notes from notification bar). That's convenient in and of itself; but to my delight I found that when writing such a quick note, the S Pen works, not only in the title but in the note area itself! It's still not working in regular text notes, but this should be some relief.