What is the curse of the law of Moses? [1st of 3 questions on this topic]

Deuteronomy speaks several times of a curse attached to God’s law given to Moses, especially in the book of Deuteronomy (e.g. 11:26-30 & 27:4-26.) It is also mentioned elsewhere in the O.T. and Paul goes into this curse to help Christians avoid it (e.g. Galatians 3:10-12). In principle, the law of Moses could bring either a blessing or a curse. That was its very nature. But **this question is only interested in what ‘the curse of the law’ is.** Because this is so vast a topic, I have posted 2 separate follow-up questions, to prevent massive answers, or a debate arising, or lots of comments. The other 2 ask ***‘[Who lie under the curse?](https://christianity.stackexchange.com/questions/107549/who-lie-under-the-curse-of-the-law-of-moses-2nd-of-3-questions-on-this-topic)’*** and then, ***‘[What are the consequences of the curse?](https://christianity.stackexchange.com/questions/107550/what-are-the-consequences-of-the-curse-attached-to-the-law-of-moses-3rd-of-3-q)’*** This question is scoped for any Christians who believe perfect obedience to God’s laws are the goal all Christians should, and could, aspire to, to be justified; but as there may be very few such individuals on this site, to also seek answers from those who say such a thing is impossible, but that there are aspects of God’s law Christians must follow, albeit not with salvation in view, but to please and honour him.