Hi
There's also THIS ONE.
Regards Benny
I highly recommend to start there: "FreePascal from square one" is written by a highly regarded professional author with over 40 years of Pascal experience. There is not much "code" in it, it is more a sound programmer education.
Where his TurboPascal books and his Delphi stuff made him "quite" some money, he wrote this book for the community and for free.
( Aside: he writes also very good scifi fiction, check Amazon )
A lot of the code stems from his previous best-sellers, but he also handles FPC specific subjects.
For Lazarus - not FreePascal -, you may need an additional source to start, though.
He is also on this forum sometimes.