some questions ....

ummmm so i just found out what this is and i may have been oshiing ..... without my knowledge on what oshikatsu even was ..... ? SO I HAVE SOME QUESTIONS NOW

1 . can you oshi an entire kpop group ?

2 . how do you start oshiing ?

3 . okay as i said about oshiing an entire kpop group could i also oshi two characters or is that too much

4 . i m not allowed to have pins so can ita bags store photo cards too or will i have to convince my mama to let me have pins

OKAY THAT S IT ANY HELP IS WONDERFUL THANK YOU