Lens Correction and JPEGs

Hi,
I'm new to LR. I've spent the last two months watching every tutorial, practicing with a portfolio/video instructional off the Adode site and reorganizing my own photos and folders on my computer.
I finally took the "bold" step to put a few of my photos into LR. All my photos are from either a Nikon 3000 or 3100 with the same lens AF-S DX Nikkor 18-135mm f/3.5-5.6G ED.
Also, all my photos are JPEGs.
1) In Lens Correction > Profile > Enable Profile Correction there are 3 options
Default (no make/model options)
Auto (no make/model options)
Custom > when I click this I get the model and Adobe profile for the Nikon AF-S Nikkor 14-24mm f/2.8G ED
Is the Adobe profile the same for both lenses? The 14-24 and the lens on my camera - the 18-135?
Default and Auto look the exact same. If I click Custom, the image becomes a little more exposed. To my eye, Default/Auto look better.
2) Also, should I "check" chromatic aberration for all my photos? I'm not sure how this feature works in LR with JPEGs.
3) Considering where I am and my skills at this point, what is the best recommendation going forward, for learning LR and working with my JPEGs.
Since I'm going to be essentially working only with JPEGS for a while, what lens correction should I use with these photos? Default/Auto/Custom?
4) Are there any other settings that I need to pay attention to with the camera/lens/file type that I am using while trying to learn LR?
I'm starting to realize from my readings, that JPEGS will have a more limited range of development in LR and "LR will display only the profiles available for the file type of the selected image."  Lens profile support | Lightroom 5, 4, 3 | Photoshop CS6, CS5 | Camera Raw 8, 7, 6
I want to become a more serious amateur and enthusiastic photographer, but I also don't want to spend 15 minutes editing/developing every semi-decent photo I take.
As an aside, my 3100 has a shutter problem, so I will be upgrading at some point (probably Micro 4/3) and I plan to explore shooting RAW or a combination of RAW/JPEG somewhere down the road.
Thanks
Andrew

As I understand lens correction profiles, most are written for RAW photos only, and there are only a few profiles written for JPGs. That would explain why you don't see your specific lens under Custom.
2) Also, should I "check" chromatic aberration for all my photos? I'm not sure how this feature works in LR with JPEGs.
I'm certainly not the biggest expert on chromatic aberration, but it seems to me that the chromatic aberration algorithms are looking for certain types of coloration at "edges", and I don't see why that would be different for JPGs compared to RAWs.
But I'm confused by the actual question ... checking the box and seeing if it makes the photo better seems so simple that I don't really understand why you had to ask the question.
3) Considering where I am and my skills at this point, what is the best recommendation going forward, for learning LR and working with my JPEGs.
Since I'm going to be essentially working only with JPEGS for a while, what lens correction should I use with these photos? Default/Auto/Custom?
Again, the learning process in Lightroom is ... just do it. You can't harm your photos, you can always undo whatever you did that you didn't like. The lens correction you choose is the one that makes the photo's appearance look best to you.
4) Are there any other settings that I need to pay attention to with the camera/lens/file type that I am using while trying to learn LR?
Any setting and any slider and any tool might be the right one for your photo. There is no general setting that EVERYONE uses, as the reason software provides options is that some people want it one way, and other people want it a different way.
I want to become a more serious amateur and enthusiastic photographer, but I also don't want to spend 15 minutes editing/developing every semi-decent photo I take.
The learning curve can be difficult, but as I said, editing your photos will never harm your originals, and you can always undo whatever you did. So ... just do it.
I am concerned that even as a beginner, you think it might take you 15 minutes to edit a single photo. Unless you are doing a HUMONGUS amount of brushing, this should never take 15 minutes, even for a beginner. Yes, of course if you want everything to be absolutely PERFECT, then it will take longer, but there really is no such thing as a PERFECT photo. Your goal ought to be (in my opinion) making the photos look GOOD, and learning what the sliders and tools do as you go. And certainly there is no unique determination of what a GOOD photo is, a photo that looks GOOD to you may not look good to someone else, but that's kind of irrelevant, its your photo, it should only matter that it looks GOOD to you.
You said you watched tutorials, are these tutorials helping, or not? Do you feel you have learned the basic purpose of (some of) the develop sliders and develop tools, or not?

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