What 3 concepts would I high light from this lesson?

in my case, i must mentioned this three concept, because they are important for a person who want learn other idiom. first one LEARNING is the learning es el development gradual of the ability of L2 to be using naturally in a situation communicative with others wich already knows the L2. second one ACQUISITION is more applied in science processes to accumulating the features of knowledge like vocabulary and grammar normally in a institutional environment, and finally BARRIERS to many it is low perfil because when a child doesn't want learn L2 is the last thing mentioned, but for me is very fundmental, if they dont want learn L2 or maybe their environment (classroom, home, city...) is not motivated, or their emotions (i.e. in a class their peer make them a joke when he/she pronunciation is wrong) also the insufficient hours for to go to class, etc.