Definitely go with Maangchi, she's a treasure! I snagged a copy of Maangchi's first cookbook when it was on sale on Kindle, it is easy to follow and convenient to search for things to try and cook. I recommend going to her site or her YouTube channel to see what you fancy and starting there.
Aaron & Claire's YouTube channel is another one I like watching, simple and easy to follow. Aaron likes to emphasise using what's available rather than going out to be more ingredients. For less traditional Korean meals I look at: One meal a day which showcases what the YouTuber cooks for their meal a day and Plan D, a lifestyle vlogger who cooks at home a lot and I get a lot of inspiration from her dishes.