good beginners book ?

Hello im new

What is best beginners book ? im already playing 2 years for fun but seriously no math involved at all.
Im reading poker math that matters by owen gaines im not ready yet but im worrying how can someone use all those calculations at the table ? my brain would go literally crazy to think about the odds/outs betting pot size , EV etc. all in once and by some of you multi-table.

Is it maybe better to use something like a poker indicator which gives me the calculation's on cashgame then to calculate them all your self ?