Given there's the rather nasty CVE-2015-3641 in pre-0.10 (details aren't released, but see https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-June/009135.html ), no-one should be using anything less than 0.10 for new coins.
Is that right. The first link passes you onto the National Vulnerability Database, who find no record of the number.
I am sure you're right, what in layman's terms is it?
I have taken two bitcoin clones (9x) past the 1 million block point.
But anyway, the point is if he wants to learn putting him n BTC 10x is hard work. The early manuals were written for 8.6 (I/m certain). They give a good starting point. They sadly make a few mistakes, but it is a good starting point. In itself 8.6 is too outdated, it does not even have a getnetworkhashps call.
I have an even better one than spots has if you are talking scrypt. The link is on my other computer. But you fill the values in and a source is spat out (it looked okay to me, and it compiled). I have no need of litecoin clone so went no further.
I will find the link and post it. The site could be gone, though.
Still there
build-a-coin.in
could be awful in practice of course