Sources:

RuTracker - https://rutracker.org/forum/index.php

1337x - https://1337x.to/home/
Release groups: QxR, UTR.
Search: title QxR

Subdl - https://subdl.com/
Subtitles.

TorrentGalaxy - https://torrentgalaxy.mx/

RARBG dump - https://rarbg.reddiitserver.workers.dev/

YTS - https://yts.mx/
Last resort.

EZTV - https://eztvx.to/home
Series.

MVGroup - https://forums.mvgroup.org/
Documentaries. You need to register.

To play MKV, MP4 or AVI file install K-Lite Codec Pack Standart and open file with Media Player Classic.

Hotkeys for Media Player Classic:

Ctrl+L - to load subtitles. W - to turn off subtitles. F1, F2 - to move subtitles. Cltr+O - to load audio.

To rip DVD or Blu-Ray:

1) Get the disc. Buy it or rent it from local library.

2) Extract contents of the disk into MKV container with MakeMKV.

3) Compress MKV with HandBrake. I use H.264 MKV presets. Before starting thoroughly check Audio and Subtitles. If there is 5.1 track it should stay 5.1 in the output. If HandBrake uses 100% of CPU, Video->Advanced Options: threads=2

To rip from streaming services, look for pazu streaming service name on 1337x and BT4G.