The most effective system combines:

1. High-frequency vocabulary

Learn the words that appear constantly.

2. Massive comprehensible input

Read and listen every day.

3. Recycling

Meet the same vocabulary repeatedly.

4. Rich context

Learn words inside stories, conversations, and situations.

5. Retrieval practice

Speak and write regularly.

6. Gradual depth

Learn meanings first.
Then collocations.
Then nuance.
Then automaticity.