> Haven't heard the term, and I'm not from a western country
Understood. Indian music uses Sa-Re-Ga-Ma-Pa-Dha-Ni, but it means the same thing. The key to understanding that system is that Mi-Fa and Ti-Do (Ga-Ma, Ni-Sa) are half-step intervals (consecutive frets on the guitar), every other interval is whole step (skip a fret). Historical Western solmization doesn't even use Ti (the indian Ni), so everything always revolves around that single Mi-Fa and there are fewer syllables to remember - "mutations" where the syllables rotate in meaning are used instead. (If you search for videos talking about "Italian solfeggio" there's an episode of the Nikhil Hogan podcast talking about why these older systems actually make musical sense, despite seemingly being more complex. This system was what professionally educated musicians learned back in the 18th century.)
So if you know what solfège note you're playing, that tells you immediately how nearby places on the guitar fretboard will relate to the scale. Notes on other guitar strings are also related musically via interval relationships that depend on the tuning, and can be derived quite easily or committed to memory.
BTW, I think anyone who's interested in music to any extent should learn to read standard notation, even if they only play guitar. It's the language that literate discourse about music has relied on for hundreds of years, at least in the West. And the basics are quite simple, being founded on the diatonic scale just like solfège.