This might sound a bit stupid. I just completed phonetics and phonology from Grady's "Contemporary Linguistics". I'm still in my schools and preparing to join bachelor of arts linguistics in a university. So I'm self studying and occasionally I watch videos from YouTube. And I'm wondering whether I should pause momentarily and study additional books on phonetics and phonology first like Ladefoged, acoustics and stuff or whether I should continue with morphology or whether I should study both. How do you people in college do that? What about other subjects that you have taken? How do you manage all of them?
University students usually do what they are told to do, so it depends on what they are told to do. The range of variation in what students are told to do is considerable, and it's hard to evaluate 200 different study plans (though I don't think you will get 200 answers here).
My main recommendation is that you get a reputable foundation. Use a book, not a YouTube video constructed by someone who doesn't know the subject matter. My second recommendation is to try to learn by doing, rather than learning by memorizing. A variant of that prescription is to learn by producing (writing papers), not just solving problems (filling in answer sheets). My third is to approach the subject incrementally. You need to know a fair portion of the phonetic alphabet and have some idea about phonetic properties in order to understand features which are fundamental to phonology, but you don't need to know the entirety of the Ladefoged text (in fact, you'll still come up short if you are based just on the Ladefoged text). If you can't do basic morphological analysis of e.g. Turkish, you will struggle with doing phonological problems: but you don't need to know how to solve phonological problems to understand basic phonetics.
IMO phonetics, phonology and morphology form a coherent triad; and syntax and semantics forms a coherent pair. Semantics has a tangential connection to phonetics, but as a practical matter it's better to focus on smaller bits. It is also better to not get too focused (e.g. reading everything there is to read on phonetics first).
My intro to linguistics started with English syntax, because it most clearly demonstrates the notion of "grammatical rule" and methods of analysis. This is a very un-traditional way of presenting things. I suspect that such an approach does not work well with most textbooks. I suggest using John Lawler's materials (Pt. 1, Pt. 2), because it best fits the kind of approach that I just advocated.