pejzaĝo. Where does this come from; at a loss as to how to memorize it.
Rus. пeйзaж, Pol. pejzaż, Fre. paysage, Ita. paesaggio
The first two borrowed it from the French.
Esp. Paisaje, Por. Paisagem
If you know Spanish país (country) and the common French suffix -age, that's how. Actually, just now, I correctly predicted the existence of the Spanish word "paisaje" - Googled it and it seems to exist.
when is it 'ci tiu' and when 'tiu ci'?
No difference. Note the hat over the C in both those expressions.