The Light Red Line is operated by the SRT (State Railway of Thailand). Entry into service in 2021, she links Bang Sue and Taling Chan. It offers one more option and probably the most practical one to get to Taling Chan Floating Market from the center of Bangkok. You just have to combined it with the MRT metro to get there.
Once again, this line has it own system and operator and use its own tokens as tickets. However, it seems that you can use your credit card on the gantries (I have not tested).
Bangkok subway is called MRT. The metro line only covers a small part of the city even if connected to the BTS it offers more opportunities. The MRT is very clean, has air conditioned cars and is especially convenient to get to Grand Palace, Wat Pho or Chinatown.
The Chao Phraya Express boats run regularly on the river running through Bangkok. They go to all monuments and interesting places on the river shores including Wat Phra Kaew, Wat Pho and Wat Arun, the three must see temples in Bangkok. Fare is cheap.
Taking the bus to get around is clearly not the easiest mean of transportation to use for a foreign tourist in Bangkok neither the fastest one but it's the cheapest one. Bangkok bus network is wide and you can go almost anywhere but just need to be patient.