How to make light, regular, bold medium etc

I am very new glyphs I am learning day by day. I just want to know is there any easy way or direct way to make different widths of fonts easily, like light, regular, bold medium etc.

You would start by drawing the each glyph twice, once light, and once bold. This is done using masters. So you need a Light and a Bold master.

Then, you can create fonts from these masters using instances. Instances can be the same as masters (this gives you a Light and a Bold font), but instances can also be between masters (giving you Regular, Medium, Semibold, etc. font). Instances can also be outside of masters (like an Extra Light or Extra Bold), but that gives you less control, so it is not as common.

To learn more, have a look at the Multiple Masters tutorials: