8 months old dosent listen

Hi mummies my girl 8 months now she seems to understand what I trying to say like I give her milk I ask her to drink finish n sleep she really sleep but sometimes when I said like no to her she will keep laugh or smile and giggle a lot or even I say like Nono u gonna fall down already becareful she will pause abit then do again then laugh just to see my reaction . Erm just wondering how to manage get your baby to understand and listen ? I’m a newbie mum and single mum so I’m kinda stress out at I’m working and also juggling take care of my girl alone so girl been very clingy then usual keep wanna me ard with her if not she will cry and she been teething alot