Filling the gap between edge of carpet and wall

[Portobello Girl]

Hi - i have a carpetted room with floorboards underneath. There are slight gaps around all the edges of the carpet and the wall through which I think ladybirds are coming through. I'd like to seal up any gaps. What should I use?

I also have some gaps around the edges of my sash windows through which the ladybirds are also coming - are there any easy-to-fit draught excluders that I can fit along the edges of my sash window whilst still being able to open them easily?

Many thanks!