Hi again,
My problem is that all people are 'overeducated' today, and looking for an answer I have found that all the answers are (mostly) outdated and there is no use in trying to follow them. So, I need a fresh new (October 21st 2016.on...) answer. My question is: There are 4 pictures that I want to put like, 2pictures up, and 2 pictures down, so I want them to be all together in one, let's call it, 'frame. Found some answers that are explaining what to do with layers, but, following instructions I have done n o t h i n g. I need instructions for dummies, like: 1.open GIMP 2.8.> 2.click 'file', 'open',then select pictures that you want to open, then do this, and this, and that... ok? I want to get full information for one time in my life, not the answer that looks like:"play a little with layers, than click 'merge visible layers'...etc... Does it make problem to provide someone who doesn't know much with a complete information?
so, my question is: how to put four images together (two up, two down) so that the final image contains one big image with the four images inside? I want to thank in advance to a good person who will take a time and give me the answer. Thank you. Niko

It seems simple, you create a new Image (file > new), enter the dimensions you want.
Then open your 4 images and for each images put the image window in foreground do a ctrl-a, ctrl-c then put the destination image on foreground, do a ctrl-v, on layer list click on the + button and use tools to adjust the layer size, position etc

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Could you do a like MSpaint drawing of what you mean as an example? Description of what you want doesn't bring up a workable mental image for me personally.

I usually put smaller images into a word processor and manipulate it there.
Once done, screenshot the result.

Is that cheating?

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I think ImageMagick can do it with ease.

Edit: https://linux.die.net/man/1/convert

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in gimp see post 2

use the canvas size

for NO borders
make sure all 4 are THE SAME SIZE!!!
then make the canvas 4 times bigger
flatten it
copy/paste in each image and use the move tool to place it
anchor and flatten the image
repeat 2 more times

or

the best tool for this is Nip2 -- in most repos
open all 4

select the top 2 and join left to right
do this for the bottom 2
then join top to bottom

there is also a SLIDER to change the spacing between the two
and you can edit that color
http://imgbox.com/TT2QgWTj
http://imgbox.com/6EH2Sm1e

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Thank you John VV. It seems that it works, but I'm still slow. Have to practice a little.

YES! report to the principles office immediately!!!

ImageMagick, the montage one does the tiling of multiple images. In gimp you need to create a new canvas, or expand your current one and cut and paste each image in and move it to where it goes. Using montage takes a lot of the guesswork out and is script-able if you need to do it a lot. Or need to redo it to change image positions.