Upload & Sell: Off
You certainly won't be there by yourself, Quang - though you also won't encounter the frequent huge crowds that you see at other times of the year. (I'll be there today, as it turns out...)
If this is your first visit, a few quick thoughts about photography and other things:
1. The shooting hours start later and end earlier in the winter with the shorter daylight hours. Because the Valley is oriented in a roughly east-west direction with tall mountains to the east, certain places tend to get better light at somewhat specific times of day. The south side of the Valley can get little (or in a few cases, no!) sun at this time of year, while the north side tends to be warmer and often better lit. Shooting dawn can be a bit tricky here, as you don't easily get wide open, unobstructed views to the east.
2. It will be cold. If you start out very early in the morning, expect it to be in the twenties. It may not get much above 40 all day, if that, though there are (colder and warmer) variations depending upon where in the Valley you go. The current weather forecast, which can change, suggests that you probably will have relatively clear weather.
3. For first-time Yosemite shooter, starting out by photographing a few icons is a fine thing. A few that could easily be on your list include "Tunnel View" (from the Wawona Tunnel overlook) in the evening, Sentinel Bridge with its view of Half Dome, Awhahnee Meadows between the park housing near Yosemite Village and the Ahwahnee (often with nice low fog in the mornings), "Gates of the Valley" (known by other names as well) along the Merced River along Northside drive as you head west toward the park exits. There are tons of other opportunities too numerous to name, so wander about a bit and enjoy.