user69619: My goal is to understand better, how transactions and blocks are built raw. For that, I found several questions and answer here on StackExchange, but the best for me was this post:
Download single and specific block for study purposes
Then I followed the information in this answer and had a look at this block.
Raw HEX file of the block here.
Now my question is:
Why do I not find transaction hash in the raw hex file? 
When I am looking for a specific transaction hash (e.g. "909374f0cc117...) I do not find it. I thought each transaction is added to the block. Maybe not the hash of the transaction?

user15715: Each transaction is indeed added to the block, but only its contents, the hash is then derived by hashing the transaction data twice with SHA-256.
This image explains how a block is laid out in hex.

69619: <p>My goal is to understand better, how transactions and blocks are built raw. For that, I found several questions and answer here on StackExchange, but the best for me was this post:
<a href="https://bitcoin.stackexchange.com/questions/55188/download-single-and-specific-block-for-study-purposes">Download single and specific block for study purposes</a></p>

<p>Then I followed the information in this answer and had a look at this <a href="https://webbtc.com/block/00000000000000000a3ed9a4e25407518aa854f09fa1981adaae9455a91d1966" rel="nofollow noreferrer">block</a>.</p>

<p>Raw HEX file of the block <a href="https://webbtc.com/block/00000000000000000a3ed9a4e25407518aa854f09fa1981adaae9455a91d1966.hex" rel="nofollow noreferrer">here</a>.</p>

<p><strong>Now my question is:</strong>
Why do I not find transaction hash in the raw hex file? </p>

<p>When I am looking for a specific transaction hash (e.g. "909374f0cc117...) I do not find it. I thought each transaction is added to the block. Maybe not the hash of the transaction?</p>
 15715: <p>Each transaction is indeed added to the block, but only its contents, the hash is then derived by hashing the transaction data twice with SHA-256.</p>

<p><a href="http://2.bp.blogspot.com/-DaJcdsyqQSs/UsiTXNHP-0I/AAAAAAAATC0/kiFRowh-J18/s1600/blockchain.png" rel="nofollow noreferrer">This image</a> explains how a block is laid out in hex.</p>
