It depends on your goals.
You can get by with only learning & using tab. Many guitarists (pro & hobbyist) do fine without reading standard notation. The specific info missing from tab is the rhythm. So as long as you can get the info from listening to the audio that's a possible workaround.
I always encourage students to at least understand notation. Be able to look at it & understand what it is indicating. You don't have to become a fluent sight reader. That is certainly a higher level of time & effort! But it can only benefit your overall musicianship to at least understand it & how it relates to what you play on the guitar.
Hope that helps!
yes christopher that helps but for the time being i only want to learn songs that i have listened to so many times that ifmy hands cooperate with me i'll have no trouble with rythm. but i understand why you want students to have a basic understanding of notation. makes me think of the scene from walk the line where june carters mother said "so many musicians dont know how to read sheet music nowadays". i dont want to become a session guitarist or play classical so i think i'll just watch the tutorials just as a refresher. thanks for your help.