To sound like a native English speaker, you're expected to use a little bit of slang and acronyms.
Don't use slang or acronyms in formal writing.
Acronyms:
IBM
The ABC's
FYI
AKA
AC
ASAP
BFF
Q&A
MC
MO
TLC
DIY
BO
FAQ's
Best source:
https://youtu.be/qicetILoD2M
https://bit.ly/38L6k7r