I use Adguard’s public DNS on my router for convenience, no problems at all. In the past I had pi-hole with some lists that in the end, from time to time, broke things.

I use duckduckgo. It is Bing but with more privacy. You could try also searx, swisscows, startpage or qwant

I just use jerboa

Snowflake/bridge is used when you do not want the authorities/ISP know, you are using tor or because it might be blocked (like on contries with censorship). When you are running snowflake/bridge you are helping these users. For the contrary, if you use a normal tor relay, they(ISP, authorities, who ever is watching your connection) know, but they do not know what you are doing.

Telegram, syncthing or upload to your cloud (onedrive, google drive, dropbox, whatever you use) and sharing the link. If you are near your friend and both have android, use nearby (like airdrop but on android).

I just use jerboa it’s foss.

A i2p or i2pd router