Hobbyist Leaded Solder
A hobbyist isn't constrained by rules like ROHS or anything. Your only constraints are your soldering iron, and the availability of getting solder.

63/37 Tin/Lead Rosin Core is a relatively low temperature, easy to use, easy to find solder commonly used by hobbyists. Choose the size depending on what you are going to solder (the bigger the parts, the larger the solder you want). 60/40 Tin/Lead is also commonly used. You can try 62/36/2 Tin/Lead/Silver if you want to get fancy.

Best advice, don't sweat the small stuff :D