I know this has been discussed many times but...I have a Galaxy Tab A 16Gb with 32Gb memory card on which all my photos are stored. I am now running low on space on the hard drive and find that there are 30 apps which can be disabled but of course it then says I may upset the system I realise some are system apps but there are so many I don't want and will never use. Also many I've never heard lf. I know little about Android and fight shy of anything called rooting. How do I kniw what is safe to disable.