Американец самостоятельно выучил 20 языков

A sampling of the languages I’ve been studying recently. I’m clearly better at some than others, so any critiques or advice would be great! Languages used (chronologically): English, French, Hausa, Wolof, Russian, German, Yiddish, Hebrew, Arabic, Pashto, Farsi, Chinese, Italian, Turkish, Indonesian, Dutch, Xhosa, Swahili, Hindi, Ojibwe Interview on language learning methods: