I'm offering analysis of each of the concepts at the end of No Limit Hold 'em: Theory and Practice by David Sklansky and Ed Miller.
Concept No. 14: Raise less often than you would in limit, because raising reopens the betting, and that's riskier to do in no limit.
I think this is good advice, but not entirely for the reason given. The advice actually holds even if you know your opponent will not re-raise you, such as when you are raising all-in. This is because in no limit your raise is almost certainly going to be larger (in proportion to the pot size) than in a limit game, which means your opponent will need a stronger hand in order to call you. If your opponent is only calling with stronger hands, then you can only profitably bet with even stronger hands. Thus, you need to be raising less often. (You may protest that since your opponent is folding more often, you should be bluffing more often. In fact, you do need to be bluffing more often, but only as a proportion of your raises. Since you are value-raising less often, your bluffing proportion automatically increases. In order to achieve a reasonable bluffing rate when making big bets, it's probably not actually necessary to bluff more often.)
The reason Sklansky and Miller give, namely that it's riskier to reopen the betting in no-limit than in limit, is also true. If you hold a hand that has some outs against possible raising hands in your opponent's range, it's sometimes best to just call in no-limit even if it would be better to raise in a limit game. This is partly because it's simply more expensive to be caught raising with a second best hand in a no-limit game, but another reason is that if you are raised, you can often call a small bet (such as in a limit game) with a drawing hand for +EV, but if you're forced to fold to a larger raise (such as in a no-limit game), this is necessarily 0 EV (actually -EV if you count the loss of the amount you just raised). Even if you can profitably call a large raise, it will not be as profitable as it would be if you only had to call a smaller amount.