What grade level is foundations of algebra?

Could you clarify for me, what exactly do you mean by "foundations of algebra" in this context? Is it referring to a specific course or curriculum for students learning the basics of algebra? If so, the grade level at which foundations of algebra are typically taught can vary depending on the educational system and the individual student's progress. In many school systems, algebra is introduced at the middle school level, typically around grades 6-8, but some students may start earlier or later depending on their mathematical aptitude and readiness. Is there a specific aspect of the foundations of algebra you're curious about?