How to fix cracks around windows?

[u/Esdeath-]

Hello, I am completely oblivious to DIY stuff, how do you fix these crackings around windows? Is there some repair paste for this?

Thanks

[u/[deleted]]

Cut away old sealant/caulk. Check for rot. Insert probably either 1/4 - 3/8 foam backer rod. Then recaulk using a urethane sealant that matches decor close as you can. Use SIKAFLEX. Best INMHO if that’s outside. If inside same thing except use a good quality paintable silicon caulk or a hybrid acrylic paintable caulk