PSE-6.....Image Resizing vs. Cropping

I'm confused as to whether I should use the image resizing tool or the cropping tool. (my situation explained below)  Can someone explain the difference and what I should do?  But please note that I am TOTALLY new to photography and photoshop, and so I really need someone to explain it to me keeping in mind that I'm photography ignorant/illiterate.
SITUATION:  I'm taking pictures of my handmade jewelry. I plan on doing several different things with the photos--printing, posting online, and emailing.
From what I've read, these 3 actions require different sizes and resolutions (?).....But I've been told that printing requires 600 dpi (or ppi, right?)...........that posting online requires 72 ppi......that with emailing photo dimensions will be specified by the email recipient.      Upon uploading my pics began at 180 ppi and the actual size on the computer screen is GIGANTIC  (I assigned my camera the max 12 megapixels / 4000x3000-whatever that means).   So starting at 180 ppi how can I increase/decrease the ppi and which do I use (image resizing or cropping) for printing, posting online and emailing?
Also, does changing the ppi (or dpi, right?) affect the size of the pic?  In other words, just how much related is ppi and size? example---can I have one picture that's 5x7 and another pictures that 8x10 but they have the same ppi?  And vice-verse?  As you can see I'm totally confused on this subject.
Thank you to whomever responds.......I REALLY appreciate it.....

Thanks Joe.  You are so helpful.  This stuff can be confusing to learn.  For example - below is a chart from an article I read about jewelry photography.  Notice next to "Resolution" the folders are referred to in "DPI"?  Did the author mean to say ppi?.....because my PSE-6 does not have any functions that allow DPI changes.....just ppi.....
Recommended formats and file sizes for several categories of jewelry photography:
Folder Name
Master
For Print
For Home
For Web
Resolution
600 DPI
600 DPI
300 DPI
72 DPI
File Format
RAW
PSD
TIFF
RAW
TIFF
RAW
PSD
TIFF
JPEG
Minimum Camera Size
2-5 Megapixel
5+ Megapixel
2-5 Megapixel
2 Megapixel

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    Message was edited by: Steve M.

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    I would make an automation plug-in and a filter plug-in.<br /><br />1) Run the automation which runs your filter to gather current image <br />information<br />2) Create a temp file of the new document<br />3) Make a new document<br />4) Call the filter again to reload the temp data on disk<br /><br /><[email protected]> wrote in message <br />news:[email protected]...<br />> Hi Photoshop developers,<br />><br />> I'm a developer with a few Photoshop filter and selection plug-ins under <br />> my belt, and I have a good understanding of the SDK and tools and suites <br />> it provides. My next project is an algorithm for enlarging/resampling <br />> images to different pixel dimensions. I'm wondering if anyone has any <br />> suggestions for or experience with the best combination of plug-in types <br />> to implement this.<br />><br />> Clearly, I can't just write it as a filter plug-in, since there is no way <br />> to change the image dimensions from within a filter.<br />><br />> I'd like the resized image to remain within Photoshop (as a new window or <br />> in the original one), so an export plug-in on its own is not sufficient.<br />><br />> Import plug-ins seem promising, since they allow the creation of a new <br />> document of the required size. However, as best I can tell from the <br />> Photoshop 6.0 SDK documentation, import plug-ins cannot access the image <br />> data from other open documents (or even the clipboard), nor do they <br />> provide any support for channel ports and the Channel Port suite.<br />><br />> My best idea at this stage is to create an export plug-in to provide the <br />> user interface and calculate the resized image, and then an import plug-in <br />> to import the resized image back into a new window. (I'm supposing a <br />> further automation plug-in would then be written to perform this <br />> export/import sequence.) The difficulty I see with this approach is how to <br />> communicate the resized image data between the two plug-ins. Since the <br />> resized image will potentially be very large, the ideal solution would be <br />> to store it in channels managed by the Channel Ports suite. However, I <br />> cannot see how the channel ports created in the export plug-in could be <br />> communicated to and used by an import plug-in. The alternative would be <br />> for the export plug-in to save the resized image to a temporary file on <br />> disk, however this seems unnecessary.<br />><br />> So, my questions, specifically, are:<br />><br />> a) Is it possible to create new channels using the Channel Ports suite <br />> (sPSChannelPorts->New()) in one plug-in, and have those channels persist <br />> to be used in another plug-in?<br />><br />> b) If so, how would the channel ports be communicated between the <br />> plug-ins?<br />><br />> c) Alternately, are there any alternative architectures available for <br />> implementing an image-resizing algorithm using the plug-in types that are <br />> available for Photoshop developers.<br />><br />> Any responses would be greatly appreciated; I know this is a low-traffic <br />> forum...<br />><br />> Thanks,<br />> Matthew.

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