u/pokekitties

I’ll be going to study in London so I’m commuting. I get minimum SFE and my parents won’t help me with any other expenses so I rely solely on SFE. Is it better for me to get a travel card for TFL or those 18+ Oyster cards. My sister said it would be cheaper if I just tap in with my card but I live in zone 5 going to zone 1 and TFL charges around 7£