I watched the Girona vs Real Madrid match. Initially I thought Girona would dominate the game in this match because Girona was playing at home, and Girona's game was also very good in several matches, Girona had never been beaten and was leading the top of the standings. However, after a few minutes, Girona's defense began to come under continuous pressure from Real Madrid's attacks until the end of the match, Girona was defeated with a final score of 0 - 3. In my opinion, this was not a bad defeat for Girona, because Girona only lost one match this season. Hopefully in the next match, if they meet top teams like Barcelona and others, Girona will be able to dominate their game and beat them.
Even if you see a team like Girona playing well for a season long, do not expect them to beat or even dominate a team like Real Madrid because that is not possible. It's very rare that teams like Barcelona or Real Madrid gets dominated by another domestic league team.
I can see them getting dominated in the UCL if they face a bigger club, like how City dominated that one game against Madrid last year. But that doesn't mean that they will be able to do that for other teams as well. So, if you want to bet on any game, always try to bet on the big clubs that could win, not the teams that are getting some sort of attention these days because they had a few good games, that's not going to be possible. I personally believe the best we can do right now would be making sure that it goes smooth and we do not end up with losing a lot of money on betting teams like girona.