GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User

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i am trying to learn how to make adjustments like xray or transparency but the objects i have tried to make more see through end up a gray or green color...any advice would help

Not really sure about what you are intentioned to do, but if it's something like this...

it could be obtained by:
- opening the BG image
- opening the image you want to override
- add transparency on the latter (layer>transparency>add alpha channel)
- remove unwanted part (in this case all around the rose) using the eraser tool and/or the select by color/hue and cut)
- move that rose on top of the BG (copy, and past as a layer)
- reducing opacity of the top layer

Gave it a try. X-Ray translucence is a very subjective thing. Regardless, I used G'MIC's Relief light preset to create a mask and applied it to the extracted rose.

Here's another try using G'MIC's Gradient Norm as a mask (added anisotrophic smoothing to the mask before applying mask to rose as well). Just sharing the translucent extracted result this time.

actually i was attempting to use gimp on some pictures that are more of a private nature.....trying to have a little fun with the software

since this question is of a more private nature feel free to inbox me

still looking for help on this subject....if you are comfortable working with photos that are more private in nature please let me know....private message is fine