GoTo

GoTo <label> | <line number>

Branches unconditionally out of the normal program sequence to a specified labeled or numbered line

Example of an infinite loop:
Rem Infinite loop
ALabel: GoTo ALabel

Example using line numbers: 
10 i%=1
20 Print i% : i%=i%+1
30 If i%>10 Then GoTo 50
40 GoTo 20
50 Print "End"

Example using labels:
i%=1
UpdateCounter:
  Print i% : i%=i%+1
  If i%>10 Then GoTo ExitLoop
  GoTo UpdateCounter
ExitLoop:
  Print "End"

Output:
1
2
3
4
5
6
7
8
9
10
End

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