I think your actual question is for a list of resources to get starting making gameplay videos (Let's Play is actually owned by Roosterteeth as a title).
But I think your premise is wrong, you shouldn't go into the game play planning to do "boring parts". Today, creators usually stream for a long format "livestream" video, then they cut down that footage for a "gameplay" video, and then they will sometimes do "trailers" or "highlights", and this is a good business model.
By all means set up cool stuff and show us what you want, but you'll notice, for single player, that it will feel more organic to just play through.
They also require the same resources, as your first option is a subset of the 2nd option.
I recommend OBS, it's free and works great. In theory, you need twice the graphics capability of the game to capture it cleanly. It will stream or just record.
Past that you really just need a headset with microphone, any headset will do, but spring for a Snowball when you can, great quality and affordable. I can help (sometimes) to have voice recorded separately, but most times it really doesn't matter if you're having trouble with it.
Once you feel ready, find an affordable webcam, and you can do face cam straight from OBS, whether or not you create a second instance of OBS to record it separately.
Eventually you'll need some basic lighting, and maybe a green screen, but leave that down the road until you're already super serious.
Once you get to a point where you feel like editing, you'll need GIMP (basically free photoshop) or any picture editor you have handy that will let you work in LAYERS, very important.
And of course you'll eventually want to actually edit, I recommend Da Vinci for your first free editor. It has most of the functionality that Adobe Premier Pro or Sony Vegas has, but it's just not very intuitive.
I highly recommend you keep an eye on HumbleBundle, I got Sony Vegas for $20 through them because they occasionally do software bundles, and it's a good deal to find games (check out Monthly, it's fantastic).
Hit me back if I managed to leave anything out.