I sympathise with you OP. I've been there.
I got suspended for 4 months for gross misconduct. I thought there was just one allegation against me, turned out there were 5. They were all malicious except one which had a teeny tiny grain of truth. They had witnesses, who all hated me as I had made a complaint of discrimination against them.
I was in the union but they were useless at the time so I went to a lawyer.
As it was a first offence, I just got a written warning. So maybe that is what will happen in your case, depending on the offence.
However, I had been there longer than you so had more protections, whereas you've only been there 8 months, with no union membership so you are in a more difficult position.
10 years later, I took the same employer to court as discrimination was happening again. I used evidence from the above as evidence of ongoing bullying, discrimination and victimisation. I won my case.
As for what can be considered gross misconduct, from my suspension, it included: misuse of company computers, misuse of social media, not declaring a second income, falsifying my hours (clocking in and out). The latter one was the only one with some truth but a genuine error on my part which I could prove but they didn't care.