Learn Turkish: Ben işe tost götürürüm. - I take a toasted sandwich to work.

götürürüm uses the aorist tense (the simple present). In Turkish, this tense is used for habits, routines, and general facts. Since taking a sandwich to work is a regular habit, the aorist is the best fit. If you used götürüyorum (present continuous), it would mean you are taking the sandwich to work right now.

I thought 'to take' was almak. Why do we use götürmek here?

This is a common mix-up! almak means 'to take' in the sense of receiving, grabbing, or buying something. götürmek means 'to take' in the sense of carrying or transporting something away to another place. Because you are transporting the sandwich to your workplace, you must use götürmek.

Does tost just mean a slice of toasted bread?

Not exactly! In Turkish, tost almost always means a toasted sandwich (usually made in a panini press with cheese and sometimes Turkish sausage). If you just want a plain piece of toasted bread, you would say kızarmış ekmek.

Why isn't tost written with the accusative case as tostu?

You only use the accusative case when the object is specific and definite, like 'the sandwich' or 'my sandwich'. Here, you are just talking about 'a sandwich' in general. Unspecified, indefinite objects stay in their basic dictionary form in Turkish.