For more complex graphics you would probably still use a designer tool. But for some simple ones, you can probably code them yourself. Like if you need an arrow

For more complex graphics you would probably still use a designer tool. But for some simple ones, you can probably code them yourself. Like if you need an arrow or a hamburger menu icon, you can just jump straight into code. Sometimes I also just start with pen and paper and then figure out the coordinates from there, and adjust till it looks good enough.