One of the things which has long attracted me to the Gnome desktop environment and its derivatives is the Gnome Project's implementation of keyboard shortcuts for navigating around in their file manager, Nautilus.
Because Solus with Budgie, at least thus far, also uses Nautilus, these same shortcuts remain relevant. These are also keyboard shortcuts that long-time Mac OS and Mac OS X users will recognize and instantly be able to bring back into their own workflow.
[ALT] + [Up Arrow] : Move up one level of directory hierarchy.
[ALT] + [Down Arrow] : Open the selected folder; open the selected file
In a list view mode, if you've chosen to show expandable folders [Upper left corner "folder" menu in file manager window > Preferences > Views; cick to enable "Allow folders to be expanded"] then when you have a folder in a window highlighted, [Right Arrow] will expand it, and [Left Arrow] will either jump you to the folder containing a file if you have a file selected, or [Left Arrow] pressed a second time will collapse the list (a.k.a. tree) of that part of the directory structure.
For the rest of these useful keyboard shortcuts, simply choose "Shortcuts" from the upper left corner menu, and you'll see two pages of these clean and fairly minimalist shortcuts.
For American users in particular, and perhaps others without other specific localization needs, I would strongly encourage you to switch your keyboard language input from the default English (US) to English (intl, with AltGr dead keys). The reason for this is fairly simple. For normal use, you will see no difference at all (which is good, because you don't want to really change standard behavior) but when you sometimes need to type specific accent characters, or other such characters, it's a LOT easier to learn a fairly intuitive process than having to use Character Map or some other equally arcane means.
For example, let's take the Spanish word for year, año. It's important to have the accent over the n, because otherwise you are typing the word for ass. Not so good.
You can find this in the Character Map, and there's other ways to get at the character I'm certain, but if you instead type [Right Alt] + [n], you'll get it automatically.
Of course, other letters can take the ~ accent in other languages, such as Portuguese. In that case, because the ~ is the [shift] of that key, you simply type [Right Alt] + [shift] + [`]. Nothing will appear, but then if you type a, or o, or n, etc., you'll get ã, or õ, or ñ.
If you're trying to type the German word for street, which is Straße (remember: in German, a noun is always capitalized) you simply type [Right Alt] + [ s ] and you'll get the Esset, or German double s character ß. [Right Alt] + [shift] + ['], which is the " character, when applied to various letters will give you the umlauted version of it, with two dots above. For example, [Right Alt] + [shift] + ['] and the letter u will give you ü, which is useful if you're typing the German word for super, which many here will know is of course über. Perhaps you've ridden in one lately.
In essence, the English (int., with AltGr dead keys) layout is like the default keyboard layout in Mac OS and Mac OS X, but fully fleshed out and a bit on steroids.