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Here's a few videos to start with that introduces how its done:
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2) Turn on soldering station (600oF - 700oF)
3) Tin solder tip
Important things:
→ Having enough solder on board (nice volcanic-slope shape),
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Common soldering problems: https://learn.adafruit.com/adafruit-guide-excellent-soldering/common-problems
Two kinds of flux:
1) Rosin flux: Sticky but allows solder to flow better. Need to be cleaned with IPA properly else old dried flux will "eat" on the board
2) No clean flux: Flux that doesn't need cleaning after usage. Let's solder flow but not as nicely as Rosin flux does
Amazing resources for SMD soldering without reflow: https://store.curiousinventor.com/guides/Surface_Mount_Soldering/