Right after arrival
In Poland, there are some very popular among foreigners airports. These include, among others, Warsaw Chopin Airport, the port Reymont in Lodz. These ports handle most of directions and probably if you are going to visit Poland you'll land at one of them.
After arrival you should take a taxi to get to place where you want to stay during your stay in Poland. Of course, nothing stands in the way to start your tour from the first day, so you might want to ask the taxi driver about the nearest monument or a place worth visiting.
Taxi Services Commission in Wikipedia
The Taxi Services Commission (the TSC or the Commission) is the Government agency responsible for the regulation of the taxi and hire car industries in the State of Victoria, Australia. Before becoming a regulator, the Commission was responsible for conducting a major independent inquiry, the Taxi Industry Inquiry, into taxi and other small commercial passenger vehicle services.
The TSC was created as a statutory corporation by the Transport Legislation Amendment (Taxi Services Reform and Other Matters) Act 2011, which amended the State's prime transport statute, the Transport Integration Act 2010, and the Transport (Compliance and Miscellaneous) Act 1983.
Is taxi better than a train or bus
In every major city we have a choice about the means of transport. You may for example use the public transport, train, or at least your own car. You may even order a taxi, but some people say they are too expensive, so do not even take them into consideration.
However, the taxi is a convenient way carrier to long journeys. Most of them are equipped with air conditioning and other amenities, so the ride even in the sweltering heat is not exhausting. As for the cost of a taxi ride you can argue whether it is expensive or not. It must be remembered that the cab driver still has to get back to their city after completing the course.