Congrats on starting RCIA this fall. I will pray for you on your spiritual journey.
I think what you are experiencing is not uncommon. There are so many Catholic websites. And of course, anyone and their brother can post whatever they want online. This can make it difficult for the newcomer to sort through it all.
As per the previous poster’s recommendation, I have also often made use of Catholic Culture’s website reviews, which I find very helpful. But of course, the site is run by a Catholic layman so the reviews do not carry any sort of ecclesiastical weight to them. I appreciate that he includes reasons for why he gives the rating he does, along with examples. That helps me to decide whether or not I agree with him. I have no doubt that Dr. Mirius is doing his best to conduct his ministry and offer reviews in conformity with the mind and heart of the Church. However, I’m sure he’d be the first to say that he has not been granted the charsim of infallibility toward that end.
The Vatican website and the USCCB website are going to be trustworthy. So that’s a good place to start. There are certain topics and issues where Catholics can legitimately disagree. So simply because two websites offer conflicting opinions does not necessarily mean that one is wrong and the other right (though it could mean that).
I think familiarizing yourself with the Catechism is a very helpful first step, too. With the CCC as your reference point, you’ll grow in your ability to sort the good from the bad.