TITLE: Logic and Metamath book recommendation
QUESTION [5 upvotes]: Recently, I got interested in Mathematical Logic and now I am looking for good introductory books on Mathematical Logic for beginners. In fact, I plan to read some good books on Metamathematics also. So, if possible, in your answer mention separately the names of the books which are suitable for a beginner of Mathematical Logic and Metamathematics.

REPLY [3 votes]: You may be interested with my work : http://settheory.net, where I tried to provide an optimal exposition of the foundations of maths, starting from scratch and going fast. Of course in this rather small number of pages I could not go as far as usual books but I focused in the core concepts, with a few original aspects.