what is the actual use of '#x27;? i didnt understand from this apps lessons

Answer 1

• String Interpolation `${num}` in JavaScript — https://dmitripavlutin.com/string-interpolation-in-javascript/

Answer 2

The $ sign is used in the jquery library to select html elements more efficient (look at jquery course)

Answer 3

$ symbol can also be used for string interpolation, for example

let course ="Javascript", place = "SoloLearn";
console .log(`I'm learning ${course} in ${place}`);

Answer 4

That looks like dollar sign to me.