Texture Max Size Value related rule

What texture max size I require to set for each imported texture within the project?

By default when I import the texture, it set 2048 as default value.

If I don’t change this value then will it create any problem within graphics memory?

Shall I require to change the size of each texture manually based on its size?

As per above image example, I require to set texture max size to 64 because it’s limited to that bounds.
Share your opinion regarding this.

bigger texture → bigger quality → bigger size → bigger build size

Max size will only affect if your texture is bigger than (in that example) 1024. if your image is 64x64 it will make no difference. you will only see a difference if you set it to 32x32 but maybe quality image go worse