L at the beginning of an English word is sometimes called “Light L”.
Here we touch the bumpy spot behind the top front teeth with our narrow pointed tongue. A good way to learn this L sound is the sing any song and substitute the word “La” for each syllable. Imagine Happy Birthday but with “La”s.
L is at the end of an Englsih word is sometimes called “Dark L”.
Here we don’t point the tongue but we spread it out, so it touches on the bumpy spot and sides of the top front teeth. For Dark l some folks position their tongue just a little behind Light L
Hope this helps, and keep up the good work speaking English!