The fact that some people may not remember which spelling /word to use may not be to do with a bad education! Maybe some posters have a specific learning difficulty /dylexia and find it very hard to identify differences such as of/off, there, their, they're, lose/loose. But handy phrases, such as Bags demonstrated can help ..so good idea to share and identify common errors.
I always try to tell someone if they have food stuck on a tooth or dress in knickers.. and kindly pointing out word errors is similar... it stops embarrassment and hopefully not continued posting!
I make frequent errors due to poor typing skills and lack of checking.. but am also a poor speller!