Liquid staking: first decide whether depositing coins for a liquid staking token is an exchange or merely a technical wrapper of the same asset. That drives holding period and taxability. Open It depends on the protocol; there is no general rule.
Own validator: running a validator, sharing rewards with others or offering node services may take you out of passive staking. Then the question is whether it is a business, with its own profit calculation and possibly trade tax.
Lending: same system, but the type of income is disputed. How crypto lending is taxed in Germany.
Tax return and records
Staking income goes in Annex SO, section for income from services, not under private disposals. Keep every credit with date, time, amount and token, the euro price per credit with its source, your chosen method, the protocols and wallet addresses, and the full tax report. Annex SO explained.