Its not so much the current rule book, of which the 2023 version is the latest version they have on the umps web site, but the way they adjudicate which is fluid.
If you read the rules they are not that complex. For example - if no prior opportunity when tackled you must attempt to dispose of the ball legally but you can get away with disposing not legally if you make the attempt; if you have had prior opportunity you must dispose of the ball legally, an attempt is not sufficient. Now there is some interpretation here in terms of what is prior opportunity and what is an attempt to dispose of the ball legally, but it is way less complicated than they make it out to be and the massive inconsistencies in adjudication cannot be explained by the rules.
Holding the man is even easier. You can bump, you can push as long as it is not in the back. You cannot hold - this is easy to see, if you grab or put your arms around an opponent then that is holding - simples!
DS