This may be more involved than most people are willing to go but just wanna add:

• This can be painfully slow without a dedicated GPU. Even low-mid range dedicated is gonna be a huge upgrade over CPU or integrated GPU so get one of those (if you can) or prepare to leave it overnight.
• I recommend playing with Handbrake settings a little. Use options with HEVC (x265) or AV1 for significantly smaller file sizes at the same level of quality. If you’re leaning towards x265, an Nvidia card using the NVENC option is gonna be significantly faster.
• Handbrake has a preview feature which outputs a 30 second segment at the given settings. Very useful if you wanna tune the quality/file size.

Bonus: Look into Jellyfin for a streaming service like interface