Answer:
What an age we live in!
Someone can use the internet but they cannot tie a shoelace!
Cross one end of the lace over, and then under the other end and pull the ends tight, forming a partial knot.
Take one end of the lace and double it to make a loop.
Bend it inwards over the 'knot' formed earlier. Keep hold of it.
Take the other end of the lace in your other hand and wrap it once around the loop.
Push a loop of this other end into the space between the first loop and where theis other end crosses it.
Pull both loops tight.
That all reads as quite complicated, but it is really quite simple.
Have a look at the "related link" below this answer for an illustrated guide
The site will provide normal methods as well as specialized methods to make shoes looser, tighter, more flexible and fit in the heel. Like any skill there's a lot more to it once you get past the beginner level