questionswhen looking at tablets what features should i…

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It depends on what you are looking for.

For me it is battery life, screen size, total memory, storage space, screen resolution.

And I would recommend you stick with a supported tablet so you get official Android OS updates.

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I honestly believe you are going about this backwards. Decide what you want to do first. This determines what features become important. For example, I like HD when reading, but it is unnecessary for web browsing. Do you have access to WiFi when you will be using the tablet? Then 3G/4G become an unnecessary expense. Generally, 1GB of RAM is sufficient for most uses, but if you play resource intensive games, get 2GB. Will you need to keep a large number of files, music, movies, etc. on the tablet? Get expandable storage (microSD slot). Is portability important? Get a smaller tablet (I prefer the larger screens). Do you Video Call? Front Camera. Do you need a rear camera? Will you be using it as a GPS? Are you tech savvy? Official updates become less important (rooting and custom ROMs are available for many tablets).

There are other considerations, but this is a start.