It's not hard at all once you get the basics down.
Do some reading on cycling tanks and the nitrogen cycle if you haven't already. That's THE most important part. This will tell you what you need to know about filtration. You already have a good filter on your tank, so that's good, but more never hurts

.
Even if your tank is already cycled/established you will find out you need to know this stuff in the future; if you add more fish, set up more tanks, if you somehow crash your tank (power can get turned off for example.), etc.
The second most important part is to get an API master test kit (ammonia, nitrites, nitrates, pH) to monitor your water periodically, especially if something seems off. Also, don't start messing with your pH levels. A lot of newbs see that a certain pH is optimal for certain fish and start trying to change it, but the vast majority of fish will adapt to a steady pH outside of their optimal range WAY better than they'll handle you fluctuating it by trying to change it.
And third is to do plenty of water changes (25-50% per week is a good number, the more fish/waste the more water you need to change) and don't overfeed.
If you do the above there's no reason you should have issues. Everything else is just details and preferences.