A few pronunciation questions

I’ve noticed a few pronunciations I’m not used to from past spanish courses. The most notable is pronouncing ll with a soft j sound, but I googled that and see it’s common in some latin american countries.

But I’m a little confused about both “sed” and “naranja”. When I hear the memrise speakers say it, it almost sounds like “sed” is pronounced “seth”. And with naranja, it sounds like there is a gh sound with the “j” whereas I’m used to it just being a “h” sound.

Am I hearing these right? And are these common pronunciations or just in some countries? And are there other situations where these pronunciations are used (d = th and j = gh)?