For example in the following sentences:
1) The refrigerator is next to the window in the kitchen.
2) The refrigerator is near the window in the kitchen.
3) The refrigerator is beside the window in the kitchen.
Based on my search I really didn't find an difference between such sentences. I want to be sure that since I'm writing down synonyms for my personal practice enriching the vocabulary in writing and speech. So far, I used to use "near" rather than "next to" and "beside".