Someone enlighten me on campaign contributions.

[MicaelS]

How much can an individual donate before / after the primaries to an individual candidate?

To the Local / State / National Party?

If my candidate does not win the nomination, does that affect my contribution to the candidate who does?

[MichiganLefty]

1. Someone correct me if I'm wrong

An individual can contribute $2,800 at most to a candidate for federal office in a single election cycle. That means you can give $5,600 to a single candidate in an election year: $2,800 during the primary campaign, and $2,800 more during the general election.

https://www.fec.gov/updates/contribution-limits-2019-2020/

[dalton99a]

2. See chart:

A primary election, general election, runoff election and special election are each considered a separate election with a separate limit.

https://www.fec.gov/help-candidates-and-committees/candidate-taking-receipts/contribution-limits/

[Gothmog]

3. In Texas there is no limit as to what you can contribute to state party and most state candidates

There are limits as to what you can give to judicial candidates but otherwise one give unlimited amounts to state candidates in Texas I know that several donors gave Greg Abbott million dollar contributions