1. search for e.g. french (https://quizlet.com/subject/french-basic-vocabulary/)
2. look for the list(s) with the most words
3. check quality (if you can :)
4. copy them to your language directory
5. repeat
if you speak German, the addition of "Langenscheidt" could help...
Example (contains about 6000 words): https://quizlet.com/ThomasBisig/folders/franzosisch-wortscha...
For example :
"I know" : Ya znayu
"We know" : My Znayem
"He/She Know" : on znayet/ona znayet
"You know" : Ty Znayesh
"They know" : Oni znayut
etc
Knowing that 'znat' means 'To know' might not be enough to place a word in a sentence
Some suggest that it might be better to memorize sentences or phrases instead
Doing it in real-time when speaking is more of a challenge though.