With so many types of solder on the market, it can be hard to understand which is best for you. Some things to look for are a low melting point, rosin core, 60/40 lead ratio and a non required clean up. Keep your diamiter small, 0.031 diamiter is a good starting point. Do not use cheap or low quality solder. Doing so will put you at high risk of damaging your projects.
Below is a great video comparing the different most popular soldiers on the market. We recommend Kester if you’re just getting started.