A quick overview — the full conjugation and tense drills live in their own Czasowniki (Verbs) section.
Every simple (single-word) Spanish preposition. Starting with the two pairs that trip up Polish speakers first, then the rest — from everyday to archaic.
Indirect object pronouns — to whom? for whom? The natural companion to „lo, la, los, las” (direct object), which already has its own full section in Schematy.
Whose it is, and for whom — „my, your, his” before a noun, and „for me, for you” after a preposition. Two separate pronoun families, both easy to confuse with plain „yo, tú”.