Just got a smart tv + Smart IPTV app. What do I do know?

Hi all,
very new to the process. Recently bought a Samsung smart tv, and installed the Smart IPTV app.
Figured out how to upload m3u links/textfiles to my app (on the tv) but have been unable to find working links.
Can someone tell me how https://100001.onl/ https://1921681254.mx/ the process works? What is OTA? Are these m3u links I add constant or do they need to be updated? Where can I get the links? What's a good IPTV repository?
I ended up finding a few free links, and soon after I had thousands of foreign channels (many duplicates) and none actually worked when I tried playing them. Is that what happens with free repositories?
I really only want some cable US/CAD stuff, not big into sports or cooking.
 
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