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Guitar necks move with changes in humidity. Wood absorbs and losses moisture all of the time. A neck that is painted and has a painted fingerboard will be less prone to thiis. Still, it is normal to need to make truss rod adjustments a couple of times per year. If the action feels high or you are getting some fret buzz, check the relief. This video of John Surh shows how to do it. I adjust the neck almost straight, just the smallest gap at the 8th fret when depressing the first and 17th frets. If you like the original set up, you should be able to get back to it by adjusting the truss rod a bit. It is a two way rod so you can add relief as well as make the neck more straight. Use the included steel rod to turn the wheel one circle at a time and then check the relief for the desired effect. After an adjustment, allow the neck to sit for a bit to see the full effect of the change before making further adjustments. To make the neck more straight, less relief, turn the wheel towards the high E string. If the action is too low or you are getting some fret out, you can add relief by rotating towards the low E. If the neck has the desired amount of relief and you prefer higher or lower string action, adjust the saddle heights by turning each saddle screw the same amount to keep the string heights consistent with eachother.
It can be a best practice to store guitars in their cases. Otherwise it is a good idea to use a hygrometer to monitor the humidity level in your music room to keep it close to 50% RH. This means using a humidifier during dry winter months. I recommend Venta dehumidifiers (https://www.venta-air.com/en_us/product-category/humidifiers/). Misting ones will leave a residue on everything in the room. Wick type humdifiers quickly get mouldy quickly. The Venta's cost more but do not require the purchase of filters/wicks.
If your guitar has Gotoh SD91 or HAPM vintage locking tuners, changing strings the first time or two can be a challenge. The following video shows how to remove and reload strings.
For guitars with a two post tremolo such as a Floyd Rose or Gotoh, the bridge plate is ground on the underside to a "knife edge" where it touches the posts. Turning the posts under string tension can damage the posts and knife edge preventing the tremolo from moving without bias. If the post heights are changed, do not do so under string tension.
Guitars with a Gotoh Floyd or a 510 with two posts have locking studs. You will notice there is a hole inside of these posts where a smaller allen wrench can be inserted to lock and unlock the posts. It is recommended to not adjust the height of the studs. Changes in action usually can be fixed with a truss rod adjustment. If string heights need to be adjusted for player preference, this can accomplished by uniformly changing the saddle heights. If the post heights are changed, make sure it is done with the strings slack and the posts unlocked! Accidentally turning a posts while locked will damage and widen the bushing hole. Repairing a loose busing involves gluing in a dowell rod and redrilling a new bushing hole. This is a repair to avoid!
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