Last year, I purchased and read Craig Campobasso's book: "The Extraterrestrial Species Almanac" EXCELLENT BOOK!!! Worth every penny!! I get the sense the book is true, and not fictionalized - I hope I am not mistaken though!
An open, discerning mind along with a healthy dose of skepticism is truly needed for navigating the vast amount of "info" AND the individuals furnishing that info in distinguishing the truth from the lies and disinformation on the subject of extraterrestrials and UFO'logy. I have found that you cant really have just one or maybe two "go-to's" on those topics. There just isnt any one source who knows EVERYTHING on those subjects, or who is 100% truthful, etc.
I think there is a large degree of truth from Dr Steven Greer, but not entirely. There are some definite holes and discrepancies in some of his claims. Bibliotecapleyades.net is an excellent source of info, but not everything is 100% spot-on. The "Joy of Satan" lends some credible explanation behind many aspects involving extraterrestrials, but there again, not everything. Even the show: "Unsealed: Alien Files" - of course, you cannot believe much (98% approx.) of what you hear and see on TV, but if you can "read between the lines" and can discern well, you will catch the "hints" and predictive programming aspects incorporated into each episode. These are just a few of MANY good examples.
There are also A LOT of "counter-intelligence" operatives/UFO "groups" that are fast at work duping members of the public. Luis Elizondo and Richard Doty are BOTH "CI". MUFON I believe is influenced by CI. They kicked me out of their Facebook "group" because I would challenge their "narratives" being pushed, for calling attention to the amount of group members who seem to all be duped, and buy right into the whole U.S. govt. false narratives they put forth on the topic. I mean, these folks ALL believe that the U.S. govt. is preparing to make "Disclosure"......ROFLMFAO!!!!!

I asked these folks point blank: So did you NOT take notice of the FACT that there are "CI" operatives discussing the topic on the MSM news, there were "CI" giving their "testimony" during the 2 sham "UAP" Congressional hearings???"
CI basically handles "disinformation" . That's their basic job function. I dont hear ANYONE ELSE questioning that. Then....if you noticed, at these 2 hearings, they are SOOOOO meticulously CAREFUL not to use ANY wording like aliens, extraterrestrial/extradimensional life, etc Or the fact that the public gets one "version" of the hearings, whilst Congress gets another "version". I dont hear too many asking: "Why NOW??"
Finally, the "powers-that-shouldn't-be" are never ever truthful, forthright, and straight-up about ANYTHING ELSE....and I do not hear ANYONE ELSE questioning WHY then, would this topic be ANY exception??
MUFON clearly didnt like having their false narratives questioned and deconstructed, so they booted me from their FB group. I guarantee the CI Community have their "plants" and influence well-rooted within the group. There are a FEW group members who KNOW the truth, who KNOW what's up, but they are the extreme minority. Most MUFON members seem to go right along with EVERYTHING the MSM, Congress, the CI Community, etc, etc says.....Complete "dupes"....its really quite pitiful and sad!!!