Re: packages
TO (transistor outline) packages are extremely varied.
They range from the large, metal, flanged, round TO-3 packages for power transistors to the small, plastic, half-round TO-92 packages for small signal transistors. They can be rectangular like the TO-220 packages, and they can be surface mounted like the TO-263 and TO-268 packages.
There are far too many package types!
A few of the packages are popular enough to be instantly recognizable. For others, it's easier to use the manufacturer's data sheets or a distributor's catalog pages to see what the device shapes are. Each manufacturer will use, for each device, only a few of the package types. So generally it's better to look at the data sheets for this information.