I'm trying hard to love SD 5.1 coming from Webflow, but I keep having the hardest time with what are fairly simple tasks. Currently, I'm trying to add items to a dropdown in a Bootstrap 4 menu Component, but I can't figure out how. Is there a tutorial on this anywhere?

without knowing which component you have used its difficult to guess but try"

select the dropdown menu from your working canvas
move over to the 'inspctor' panel (top right)

There you will see the menu items, select the bottom one, --- right click and select duplicate, use the up/down arrows if you need change its position

Edit- href and text accordingly,,

Got it! Never thought to look in the Inspector. Kind of a weird departure from the UI to add menu items, but it works. I assume that you have to fill in the actual URL for each link, instead of being able to choose from a list of pages in my project.

BTW, I'm using the only Bootstrap 4 Menu Component that I see that has a Dropdown element in it.

See attached.

If you start typing a page name in the href box SD will give you a dropdown with a choice of pages,

Ahh thats from the additional components not the default, I don;t use bootstrap anyway, so don't have that component, but seems you have achieved the task

There are otherways, but that was the simpliest way to explain,

Right clicking on any element displays a menu with multi choices (duplicate being one of them)

Right clicking on any selected element that is highlighted along the bottom menu, also gives many choices (including 'Duplicate) t

As far a step by step video tutorials, I wouldn't know of any for bootstrap, I use foundation 6 and have a lot of step by step tutorials that I have done, and I do individual ones too for specific probelems, but only for foundation and frameworkless

"Ahh thats from the additional components not the default..."

When you say "the default Components", are you talking about 'Frameworkless'? If I don't import 'additional components, such as 'Frameworkless' or 'Bootstrap 4', I have no 'Components' available.

Really there should be a while bunch of them

Nope... none.