ALWAYS look into the cases with small torch after you have added the powder.

Make sure that:

1) Each case has powder in it.
2) The amount of powder should "look right". Case filled to the shoulder, unless you are doing something clever.
3) Check that the amount of powder in each case is at the same level within a batch.

This will stop you from killing yourself through squib loads, or adding too much powder by mistake.
Another way people kill themselves is to use the wrong powder or too heavy a bullet by mistake.

Find someone from your shooting discipline that shoots much better than you and reloads.

Ask them to share their reloading process with you, maybe sit in on a few reloading sessions.

Take note of the equipment they use. Ask what equipment they bought and don't use anymore, and why.

Ask about what they do, what they don't do, and why.

Reloaders in general are not selfish about sharing their knowledge and experience.