Applesoft BASIC (Apple II) Commands:

CALL (Calls an assembly language subroutine)
CLEAR (Clears all variable values from memory)
COLOR= (Sets the low-res graphics color)
CONT (Attempt to continue a program interrupted by STOP, END, or CTRL-C)
DATA
DEF
DEL (Deletes lines from the program. Works on the program stored in memory,
  NOT on the screen)
DIM
DRAW
END (End current program; Not used directly from the command line)
FLASH (Makes text which comes on-screen flash; See also INVERSE and NORMAL)
FOR
GET
GOSUB
GOTO
GR (Puts computer in graphics mode; Opposite of TEXT)
HCOLOR= (Sets the high-res graphics color)
HGR (High-res graphics mode; Like GR, except GR is low-res)
HGR2 (Another high-res graphics mode)
HIMEM: (Sets highest memory position available for variables; See also
  LOMEM:)
HLIN (Example: HLIN 10,20 AT 10)
HOME (Clears screen and moves cursor to the upper-left corner)
HPLOT
HTAB x (Sets cursor's horizontal position to x)
IF
IN#x (Reads input from slot, where x is the slot number)
INPUT
INVERSE (Makes text which comes on-screen be in reverse video; See also
  FLASH and NORMAL)
LET (Sets a variable; "LET" is superfluous)
LIST (Lists program currently in memory)
LOAD (Load a program from the cassette port; NOT from the disk drive)
LOMEM: (Sets lowest memory position available for variables; See also HIMEM:)
NEW (Clears program currently in memory)
NEXT
NORMAL (Sets text which comes on-screen back to normal; See also FLASH and
  INVERSE)
NOTRACE (Stops tracing initiated by TRACE)
ON
ONERR (Specifies a function to use when an error occurs)
PLOT (Example: PLOT 20,20)
POKE (Directly inserts a value into a memory location)
POP
PR#x (Attempt to boot from slot number, where x is the slot number to try)
PRINT
READ
RECALL
REM (Remark; Do-nothing line)
RESTORE
RESUME (Resume program flow after an error)
RETURN
ROT= (Sets the rotation value for high-resolution shapes)
RUN (Runs program in memory)
SAVE (Saves the program to the cassette port; NOT to a disk drive)
SCALE= (Sets the scaling value for high-resolution shapes)
SHLOAD (Loads a high-res shape table off the cassette port)
SPEED= (Sets text output speed, 255 being fastest, 0 being slowest)
STOP (Stops program execution)
STORE (Stores an array to the cassette port)
TEXT (Puts computer in text mode; Opposite of GR)
TRACE (Displays line number for each statement as it is executed for
  debugging; Use NOTRACE to negate)
VLIN (Example: VLIN 10,20 AT 20)
VTAB x (Sets cursor's vertical position to x)
WAIT (Enter infinite loop)
XDRAW

Applesoft BASIC (Apple II) Functions:

ABS (Absolute value of an expression)
ASC (Returns ASCII value of the first character in the string)
ATN (Arctangent)
CHR$ (Character reference)
COS (Cosine)
EXP (Exponent)
FRE (Returns free memory available)
INT (Returns the largest integer less than or equal to the input value)
LEFT$ (Returns some leftmost characters in a string)
LEN (Returns the length of a string)
LOG (Logarithm)
MID$ (Returns characters in the middle of a string)
PDL (Position of an analog device, like a joystick or paddle)
PEEK (Returns contents of a memory byte)
POS (Returns the horizontal position of the cursor)
RIGHT$ (Returns some rightmost characters in a string)
RND (Random number)
SCRN (Returns the color of a low-res screen pixel)
SGN (Returns -1, 0, or 1, depending on whether the input number was negative,
  zero, or positive, respectively)
SIN (Sine)
SPC (Print blank spaces)
SQR (Square root)
STR$ (Converts a numeric value to a string)
TAB (Inserts cursor tabs)
TAN (Tangent)
USR (Jumps to memory location $0A)
VAL (Converts first number found in string to a numeric value)

Applesoft BASIC (Apple II) Reserved Words:

AND
AT
NOT
OR
STEP (Used with FOR)
THEN (Used with IF)
TO (Used with FOR and HPLOT)

To use graphics with the Apple II, you must first:

1. Set it to graphics mode, with either GR, HGR, or HGR2
2. Issue COLOR= or HCOLOR=