Here's a really good free one: OpenSecurityTraining2 Architecture 1001: x86-64 Assembly https://p.ost2.fyi/courses/course-v1:OpenSecurityTraining2+Arch1001_x8

Here's a really good free one: OpenSecurityTraining2 Architecture 1001: x86-64 Assembly https://p.ost2.fyi/courses/course-v1:OpenSecurityTraining2+Arch1001_x86-64_Asm+2021_v1/about https://p.ost2.fyi/courses/course-v1:OpenSecurityTraining2+A... They also have RISC-V and many other for debuggers and reverse engineering tools (ida/ghidra for example)