I am relatively new to qgis. I have GPS coordinates of two types of sites in csv format, (water point site and sanitation site). I wanted to find out if it is possible to create a 100 meter radius on all the water point sites to find out how many of the sanitation sites are outside the 100 meters.

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    You need to create a buffer. Look at buffer tool in QGIS. To avoid problems in case your CRS is not in meter, check this question. gis.stackexchange.com/questions/106988/create-buffer-in-meters – ahmadhanb Sep 18 '19 at 13:00
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    You could also use a 'Select by Location' (in the Vector -> Research Tools menu) to select all sanitation sites that are within 100 meters of a water point site. That way you don't even need to create a buffer. – JiyuuSensei Sep 18 '19 at 13:10

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