beginning pot 100
caller calls 100
hero bets POT 100+300=400

Pot now 600

Vilian BES POT I am thinking that means he is calling the $300 raise and betting the 600 pot making it 900 to go but I know I am incorrect. The book I am reading says this means Villian is making it $1300 to go

Would someone explain to me how I is $1300 POT it here

I can see that when hero be $400 to make the pot $600 that if we add the fac tthat $300 of the $400 was a raise than $400 plus 900 =$1300 bu if that is correct I guess I just don't see the logic since $100 of the $400 was a call

2 days driving me nus--Help and thanks

Probably the author(s) of the book are unclear in terminology, but regardless, if Villain is the same person as the original caller, then he potraised to $1300 (that's the total amount invested in the hand = $400 invested in total to call Hero's raise + $900 in the pot after that) by $900 ('$900 to go' as you put it).

If Villain is a cold reraiser (not the original limper), the total amount needed to invest into the pot raise size is $1400 ($400 to call Hero's raise + $1000 lying in the pot after this call), so it's a raise to $1400, or $1000 over Hero's raise, or $1300 over the limp (call). Maybe the author(s) meant the latter, which is a strange way to announce a raise.

However, it's strange that the limp amount is equal to the initial pot size. Is the game played with only one blind?