In Over My Head Electrically

[Ifr4phun]

My knowledge on batteries/solar/inverters is VERY limited. My 4 AGM batteries in my 07 AE 42F bit the dust. Since it's getting warmer out, I ordered 4 100 amp Lithium batteries. My plan was to just replace the AGMs. The more I read I'm now wondering if I need to replace my charge controller, re-calibrate my invertor and will my converter charge my batteries when I'm plugged in to shore power? An advice in LAYMEN's terms would be appreciated.

Thanks in advance
Bryan