How to decipher the abbreviations of AVR and ARM assembler commands?

Question

Programming

I must say right away that I need a description of what each processor instruction does. This good is enough even in Russian in the internet, books. I want to know how abbreviations and abbreviations stand for. Here's an example:
1) out, in everything is clear here anyway, because there are no abbreviations.
2) rjmp it will be some kind of (right?) jump. At least somehow, but I can understand what is hidden behind this reduction. And then it’s easy to understand what she will do.
3) ldi, sbrc, sbrs, sbi, cbi and a bunch of other similar ones. I don’t know about English speakers, maybe it’s not difficult for them to decipher it, but for me it’s just a random set of letters. According to them, I can’t even imagine what the processor will do. If I remember how it is deciphered, then it will be easier to navigate in this.

Answer 1

LDI - Load Immediate
SBRC - Skip if Bit in Register is Cleared

....
And stuff like that, I found in half a second in Google. And then it became even easier - right on the site www.atmel.no/webdoc/avrassembler/avrassembler.wb_L... there is a search for commands, aha.