How do you weather strip a door?

along the door(inside)sill and a sweep at the bottom. Inside sill is where the door touches the frame. Foam made for this is easy to find. It just sticks on. You don't have to take the door off to do this.

Usually the bottom of the door you can slide the weatherstrip out as it is in a metal casing. Not sure how old your door is or if it's possible. That is the way mine is.

https://www.youtube.com/watch?v=-qEmEi2jMbk

Hello,

You could add a underdoor seal weather strip Amazon has them http://a.co/a7f3z2p you could go to Amazon and also do a search for different ones. No removing your door either.

Example of weatherstripping around the door. Screws to the outside door frame with rubber against the door.

https://www.homedepot.com/p/M-D-Building-Products-Top-and-Side-Door-Jamb-Weatherproof-Set-01271/100164928?cm_mmc=Shopping|THD|google|&mid=sXHAZG02o|dc_mtid_8903tb925190_pcrid_111414437105_pkw__pmt__product_100164928_slid_&gclid=EAIaIQobChMI2oTOsM_f2AIVhrbACh3VHA2sEAQYASABEgJ5Y_D_BwE

Example of door sweep. Screws to the outside bottom of door.

https://www.lowes.com/pd/M-D-36-in-Entry-Door-Sweep/1194277

Metal door! You would have to predrill holes for screws on the bottom of the door. Door frame should be wood so no problem there.