There are a number of materials on the market that help with soldering, prevent oxidation. someone says flux, someone says soldering paste also someone says flux and soldering paste are same.
Frankly, I'm confused.
I also bought 4 different products that I saw in the market. Some are creamy, some are completely liquid. I can use the cream ones in some way, when I pour the liquid ones on the circuit, it flows and gone. I do not know exactly where and how these products are used.
Please tell me where to use each product and what is the benefit.
These are fluxes and soldering pastes:
in side photo