add operands to guide

GUIDE.md

@@ -9,21 +9,30 @@ Quick reference for compiling to Reef bytecode.
 OPCODE operand     ; comment
 ```
 
-### Labels
-```
-.label_name:       ; Define label
-JUMP .label_name   ; Reference label
-```
+### Operand Types
 
-### Constants
+**Immediate numbers** (`#N`): Counts or relative offsets
+- `MAKE_ARRAY #3` - count of 3 items
+- `JUMP #5` - relative offset of 5 instructions (prefer labels)
+- `PUSH_TRY #10` - absolute instruction index (prefer labels)
+
+**Labels** (`.name`): Symbolic addresses resolved at parse time
+- `.label:` - define label at current position
+- `JUMP .loop` - jump to label
+- `MAKE_FUNCTION (x) .body` - function body at label
+
+**Variable names**: Plain identifiers
+- `LOAD counter` - load variable
+- `STORE result` - store variable
+
+**Constants**: Literals added to constants pool
 - Numbers: `PUSH 42`, `PUSH 3.14`
 - Strings: `PUSH "hello"` or `PUSH 'world'`
 - Booleans: `PUSH true`, `PUSH false`
 - Null: `PUSH null`
 
-### Variables
-- Load: `LOAD varname`
-- Store: `STORE varname`
+**Native function names**: Registered TypeScript functions
+- `CALL_NATIVE print`
 
 ### Functions
 ```