You don't learn words in a single day.
Use flash cards.
Determine how many cards to work with actively during a session. Start at about 10 and adjust up or down according to your needs and abilities.
Work with each card during the session until you get it correctly three times in a row, or three out of five times in a row.
Following sessions. Review active cards from previous session, the same way (3x in a row, or 3/5).
Add new cards as you remove old ones from the active pile.
Keep cards in the active pile until you get them correct 3 sessions in a row or 3/5. Them move them to a review pile (once every few sessions).
Remove a card from the active and review piles once you are sure you know them. Then review them once in a rare while.
Mix the cards up when you review.
Practice sometimes from English to target language, and sometimes vice versa.
Long term memory requires reading, writing, speaking the words aloud, and hearing them. (The first three you can do with flash cards). You decide which to do during a session, but over the course of your session you need to do all of them.
Practice using them, whenever you can, in complete sentences (writing, in your head, translating what you hear around you, your own inner thoughts, etc).
taught French to English speakers; native English speaker