Reddit mentions of Advanced Language Construction

Go and buy these three books: The Language Construction Kit, Advanced Language Construction (don't worry, it's not that advanced), and The Conlanger's Lexipedia. And if your conlangs are designed for made-up worlds, then get [The Planet Construction Kit] (https://www.amazon.co.uk/Planet-Construction-Kit-Mark-Rosenfelder/dp/0984470034/ref=pd_bxgy_14_img_3?_encoding=UTF8&psc=1&refRID=W79ND56BKPK8EKXT2VQZ) too. If you want to make cultures that are not European then I'd also suggest The China Construction Kit!

Of all of these I'd suggest that you definitely buy The Language Construction Kit and see how you get on. I'd also suggest buying some grammar books of languages you're interested in, and even go so far as to learn a second language if you don't speak one. Having knowledge of at least one other language will help you a great deal.

/r/conlangs !!!

Here's a good podcast.

Book from the guy that created Dothraki (he's also on the podcast every now and then) about constructing languages

The language construction kit. Gives you a general overview of how languages do things and how you construct languages

Second part of the LCK. Highly optional

After you're done with either the podcast or the fist LCK, you might as well get into the grammar of other languages instead of using language construction things.

Don't do auxlangs, though.

Edit: There's also a planet construction kit in case you want to get straight into world building as well

Yeah, looking back at that thread some of the complaints are pretty stupid IMO. But the LCK is still a good book to start off with.

You might also want to check out its sequel, Advanced Language Construction. It's pretty good and covers some other interesting topics like creoles, sign languages, and NW Caucasian verbs.