Reddit mentions of iCrimp Ratchet PEX Cinch Tool with Removing function for 3/8 to 1-inch Stainless Steel Clamps with 20PCS 1/2-inch and 10PCS 3/4-inch PEX Clamps and Pex Pipe Cutter- All in One

If you need a super quick fix - i would just cap off the red one (from your pick it looks like the red one came disconnected. However i would simply fix the whole thing. Also, if your faucet has a single handle - water could leak from cold side to hot side.

The issue is figuring out if your faucet itself is done for. They are often made out of plastic and if the plastic cracked, you cannot really fix it and need to replace the whole faucet.

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Pex is REALLY easy to work with. You need a ring cincher, rings, and some fittings.

If the sink is ok, i would guess from this limited photo that does not actually let me see the hot side threaded connection - that you need a 90 degree female threaded fitting.

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Example of cinch rings (i prefer them over crimp ring)

https://www.amazon.com/dp/B01GU4YXA2

Cinch tool: here is an all in one kit

https://www.amazon.com/iCrimp-Cinch-Tool-Removing-function/dp/B07CCH5JWG

90 degree elbow (this price seems high )

https://www.amazon.com/SharkBite-UC532LFA-2-Inch-Swivel-Packaging/dp/B00A8HSWIC

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If you have more photos or more questions let me know. I have totally redone all pex plumbing and faucets in a camper, as well as service other pex in other campers and my house.

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Edit to add:

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If this was during cold winter storage - i would suspect cracked plastic. Pex itself normally does not split, but plastic fittings (be it the elbows in the pex- faucets etc). I have come to expect the valve in my toilet to freeze each time. This winter instead of just blowing out the water lines, i actually filled with rv antifreeze and it worked! nothing was damaged. Last year i had to replace a toilet valve and the little filter window thingy on the water pump.

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I would also suspect that the faucet is cracked even if you fix the connection, there is more cracked inside and it might leak. You can upgrade to a residential fautcet. Yes it adds weight, but might be worth it.

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As i have plastic elbows etc break, i replace them with metal. It lasts longer.

I honestly don't have any resources, mostly because PEX is so damn simple that there's really nothing to it. You just need a PEX tubing cutter (for making perfect cuts and not having to clean them up) and a PEX ring tool - I prefer the "cinch" (aka "pinch clamp") style, because the rings can be removed easily if you mess up and need to re-do a connection, and because you don't need to mess with checking each of your connections with a gauge to make sure it was clamped tight enough - you just squeeze the tool together until it unlatches and you're done. Here is a kit with both the tools you need and a handful of the rings.

Then, you'll just need a ton more rings (I use these 3/4" and these 1/2" ones, get WAY more than you think you'll need just in case); you'll need the PEX tubing, get that at the hardware store because it costs a little less than Amazon and they sell the straight pieces which are easier to work with if you are doing short runs (under 5 to 10 feet); and you'll need the appropriate fittings. The fittings are super simple to understand, just grab what you think you'll need and then grab a few more extras (remember you can just remove the cinch clamp and re-use the fittings as much as you want); I recommend getting the plastic fittings when you are getting started because they are much cheaper and they have a built-in "spacer" that helps you position the cinch ring exactly where it goes. Honestly I don't re-use the plastic ones - I just toss them as they are so cheap - but the brass fittings are easy to reuse (but they do cost more). Get some PEX hangers to hold the tubing up securely, I use these ones (just pick the size you need).

To make a PEX connection, you just use your cutting tool (which cuts like butter, it's shockingly easy to cut) to make a straight cut; put a ring over the tube, then push the fitting into the tube as far as it will go. Slide the ring so it's 1/8 to 1/4" from the end of the tube (or, right up to the "spacer" on plastic fitting), then open your cinch tool, put the jaws over the "ear" that sticks out of the ring, and squeeze together until the ratcheting mechanism unlocks, which means the ring is done. It helps to have someone hold the fitting for you while you position the ring and squeeze the tool, especially on 3/4", until you get the hang of it.

If you have any questions you can DM me. Here is a picture of my completed Viega Manabloc setup, which has 3/4" PEX coming in the top from the cold water supply and hot water heater, and then has individual valves for 1/2" PEX runs that go directly to each of the fixtures in the house. By doing it this way, I used a LOT more PEX tubing, but have far LESS fittings so it went quick and gives me a lot of flexibility - now, I can turn individual fixtures off and on from the manifold. Very happy with the setup.