I still recommend Toki Pona in 76 illustrated lessons for starters
https://aiki.pbworks.com/f/tp+in+76+lessons+English.pdf
And the excellent Learn Toki Pona with Chris Youtube videos
https://www.youtube.com/playlist?list=PLiCcKStkwRigiokZ17jO2mvX-1hKi3CKy
And then jan Pije's course , now only accessible via the Internet Archives
https://web.archive.org/web/20200513202025/http://tokipona.net/tp/janpije/okamasona1.php
I memorized the vocabulary using Memrise : Toki Pona complete by solpahi
https://app.memrise.com/course/39856/toki-pona-complete/
Also an older course but very handy is jan Mato's Twitter course on TP
https://aiki.pbworks.com/w/page/68298965/jan%20Mato%27s%20Twitter%20lessons
Learn toki pona in a fortnight by astrodonunt
https://www.youtube.com/watch?v=qzWrG9iM9ac&list=PLOedATW-HKZO9BYoXRiHkX_SWi7VKsCKB
12 Jours de sona pi toki pona by jan Misali
https://www.youtube.com/watch?v=4L-dvvng4Zc&list=PLjOmpMyMxd8T9lZjF36c4mn4YgwZ4ToT6
An updated version of jan Pije's course by jan Lentan
https://rnd.neocities.org/tokipona/