Answer: Use simple a language
Repeat what you say
Make it easier for them to listen or do
Build on what they say. give them harder things to learn like after colors do numbers
Pay attention when your child speaks or when they try to say something in a language
Read with your child
Songs lots of songs this helps lots
Word games this helps to
use a language app like duolingo
play games
always be patient they can't always get things right the first time.
and always congratulate them when they get things right.
Watch movies that are in the same language with English subtitles or the language your child already knows.
Explanation: That's how I learned French same with other people who was learning French with me.
Well it’s complicated but it’s because they need to makeup for something they are lacking ecpeciecialy boys
This is heavily disputed, and honestly, it varies on a person-by-person basis. Some people are visual learners (so it's effective for them to use videos and pictures to help them study), some prefer being hands-on, etc...
Generally though, I'd say the most effective method that works for most people is through visceralisation. This is the process of associating concepts, words. phrases etc. with your different senses (sound, touch, images...). You can read up more on it by searching up "visceralisation for studying".