how do we polarize any wave?

32 minutes ago, muskan said:

how do we polarize any wave?

You titled this "light".  Are you referring specifically to light waves rather than "any waves"?  Do you know what "polarize" means?

For photons there is polarization by reflection.

http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/polref.html

 

Light can also be polarised by passing through certain types of crystals or other materials (e.g. a polarising filter as used in sunglasses).

11 hours ago, Strange said:

Light can also be polarised by passing through certain types of crystals or other materials (e.g. a polarising filter as used in sunglasses).

Or even simply reflecting off of any reflective surface.

I mean plane polarized light. 

5 minutes ago, muskan said:

I mean plane polarized light. 

Polarizers and reflections can produce plane polarized light.