A question about STP state manchine

Here are my questions:

1. Many articles say that first step (means system bootup or stp enable or ports up?)It goes to BLOCKING first, but based on BLOCKING defination, it can only receive BPDU. Nobody send BPDU. Should we say it goes to LISTENING first at init. Is it sutiable for STP and RSTP.

1. From 801.1D stp state machine (not full copy here) It say 1. port enable,by management or initisliazation 2. port diasbale,by management or failure.

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............................................................ how to understand following 4 pic (part of the state machine). the blocking pic is easy to understand. How about listening,learning and forwarding pics. I mean "--> (1,2). exp. how to understand port enable from listening state (2) and why does only Blocking use seperate 1 and 2 but others use (1,2) with one line.

(1,2) |------------------|