General Index of Game Info Resources for COMPLETE NEWBS to mobile RPG/SWGOH

Hi there...so total NEWB here...and when i say NEWB i don't just mean to SWGOH, but NEWB to ANY TIME OF MOBILE RPG game...so all of this in swgoh is incredibly overwhelming.  I'm just trying to find a resource index where i can look up anything i need to look up to learn about it..i though this was it, but it seems to be question/answer based only...not finding any premade guides that detail things like, how many credits are needed to promote characters from one rarity tier to the next from 2-7?  Same question for gear upgrades...where can i find the criteria needed between each gear level/tier?  Where in the game can i micromonitor that gear level progression?  At least with rarity i can see i'm at 65/100 and know i need 35 more shards to hit next tier...but can't find that kind of breakdown or detail for gear levels at all, aside from the INDIVIDUAL abilities breakdown which does let us know for each ability what is needed...but how to know when i'm close to hitting the next gear level?  What are the differences between the different Mod shapes and types per shape and what is primary and secondary in Mods... All things that for all intents and purposes are a whole new foreign language to me...

Things like that...where can i find this information CONSOLIDATED and searchable? is there such a thing?  Any help for this COMPLETE MOBILE RPG NEWB would be tremendously appreciated!