**Skip semicolons!**

I'll use [this answer](https://codegolf.stackexchange.com/a/107725/31516) to illustrate the point.

The original code was:

    function f(x);if~movefile('f.m',x);disp("+-+\n| |\n+-+");end

After removing semicolons, it could be reduced to the following, saving three bytes:

    function f(x)if~movefile('f.m',x)disp("+-+\n| |\n+-+")end

This can be used quite a few places, and stuff you don't even try because it looks like a syntax error often works.