Some of the changes in the hobby I can think of is that husbandry has leaned much more toward a more ventilated tank with leaf litter substrate as opposed to a sealed tank 15 years ago. There are a lot of new and different frog species/locales available now (and I am sure we have lost plenty, too). Supplements have really come along, too, to the point where it is rare to have any mention of Spindly Leg Syndrome on the board. Finally, don't fall victim to the recent trend to return to a layer of wet sphagnum in the leaf litter. We moved past that, but now a group of ill-informed influencers and companies are advocating it again.
I hope you enjoy your stay here!