With the exception of a hot air rework tool, a soldering iron should complete a nice fillet within 3 seconds. Adjustable temperature kits tend to hide the skills needed to work with the thermal mass of the iron itself.

Soldering with an iron:

https://www.youtube.com/watch?v=wvl_KYif9zA

https://www.youtube.com/watch?v=_RXugDd0xik

Drag soldering with a hoof tip iron:

https://www.youtube.com/watch?v=wUyetZ5RtPs

https://www.youtube.com/watch?v=nyele3CIs-U

Hot air techniques (mid size QFN, soic, and other SMD):

https://www.youtube.com/watch?v=v58m-S35s24

Recommended equipment:

WE1010EDU for fine and medium work (remember the 3 second fillet rule)

https://www.amazon.com/Weller-WE1010EDU-Soldering-Education-...

A set of hoof and screwdriver tips:

https://www.amazon.com/Genuine-Weller-WE1010-Soldering-ETSET...

Flux and solder wick for cleaning pad areas on PCB:

https://www.amazon.com/Lesnow-Desoldering-Electronics-Disass...

CREWORKS 858D cheap hot air tool for basic SMD rework:

https://www.amazon.com/CO-Z-Soldering-Temperature-Desolderin...

1. never use metal wool to clean the iron tip coating

2. Before use, clean by dragging a hot iron across water dampened sponge (or paper) to smear off oxidized material.

3. Never use Bismuth solder, it was invented by fools for fools. Also, indium contamination can make you go bald.

4. Your iron should choose one (and only one) of the following

i. Sn63/Pb37 No-Clean eutectic solder for low temperature industrial machinery

ii. RoHS compliant SAC305 Lead-Free No-Clean Solder

5. No Clean means the flux core in the solder may be left on the work. However, it is recommended to clean it off with 99% IPA.

6. Fume extraction blows crud outdoors, and charcoal filters just makes crud smell nice.

7. Practice PCB kits are cheap, and getting 2 in case you cook something by inserting it backwards may be wise.

https://www.digikey.com/en/products/detail/soldered-electron...

Best of luck =3