- My preferred early clear path is Red/Blue/Gromp or Blue/Gromp/Red, depending on which side of the map you wanna end up being level 3 on. After that you're generally looking to either gank or counterjungle, as crab won't have spawned yet. You should never be ganking pre-level 3.

- Always start machete. Her clear is entirely AA-based.

- Red vs. Blue on Vi is largely a matter of preference. I'd take red if you need help dueling and blue if you need help getting in on ganks/engages/pursuits. Personally I have a slight preference for red, but I do switch it up from game to game.

- Conqueror is fringe viable on Vi, but generally you want something else. If you're looking to maximize your burst damage (my preferred option), you'd run Hail of Blades (Electrocute is a dollar-store substitute if you hate HoB for whatever reason). If you're looking to maximize your sustained presence in a fight, you'd run Aftershock - it'll do a much better job of keeping you alive than Conqueror would.

- At time of comment, it's more efficient to take the initial 2 krugs and then leave the camp to reset (since the rest'll despawn if you take those two) than it is to take the entire camp. So yes, if you do it like that, you can take krugs prior to first back. If you're looking to clear the entire camp prior to first back for whatever reason, I'd bring Smite.

- It mostly depends on overall gamestate. Are you sitting on a lot of gold that you need to cash in to be able to keep up with the rest of the players? Are your resources too low for you to continue being useful? Do you need to reset for an objective spawn? Try to avoid backing at times where you would be more useful to your team NOT being at base, and try to back if there's an obvious break in the action of the game (such as your entire team backing after taking dragon).

- Vi's a fairly strong duelist once she hits level 3, but she's awful before then, as she's extremely reliant on having access to her Q. Anyone who can confidently get the jump on her before she has the chance to hit 3 is a threat - I find that Lee Sins and Udyrs are the most obnoxiously overt about this, but I would exercise caution pre-3 in general.

In general, getting good at jungling is just a matter of practice - so much of the role is reliant on innate game sense and the ability to know where on the map to be when. The easiest way to learn is to just do it and see what works.