Execution jumps to a subroutine marked by a line label. Always use Return to exit a Gosub, execution will continue on next statement after Gosub.

The line label where Gosub jumps must be in the same main/function/sub block as Gosub. All the variables in the subroutine are shared with the block, no arguments can be used. For this reason Gosub is considered bad programming practice as it can generate unreadable and untraceable code. It is better to use Sub or Function instead.