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Let me try and help.

#1. Images to be printed need to be somewhere between 240-300 ppi. A desktop printer wants to see a minimum of 240 ppi. Commercial printers usually ask for 300 ppi.  (I do 300 ppi as it works for both)All of this has to be based on pixel dimensions. For example, your poster is 18 " x 24" at 300 ppi. If you click the box for pixels per inch, you will see that your pixel dimensions are 18x300=5400 x 24x300=7200 (5400 x 7200) . If that same 18 x 24 was 72 ppi  it would be 1296 x 1728. which is the same physical print size but the quality will be very poor because the PIXELS PER INCH is much lower and not enough information to return a good quality print.

#2. If you are putting work on the internet, ppi or resolution doesn't figure into this. The information is going to be displayed on a computer monitor and it only cares what the pixel dimensions are. The resolution can actually be 0 and your information will be displayed.

So, this simply boils down to you deciding prior to developing your work what the output is going to be, either on a printer or to the internet.