If you say something “should be a thing” you are automatically now in charge of creating it or convincing someone to create it. Do not tell people who are working on things that they should realize your idea if you are not willing to put down what you are doing and work on it yourself. This advice prevents you from being the annoying ideas person.
Don’t get married. Tax benefits are minor, divorce headache is major. Separate public declaration of love and commitment from your government and financial affairs. You can still have a commitment ceremony and a big party.
Learn how to properly ask for consent. You are likely very bad at this.
The most important thing about a job is not what you work on but who you work with. Pick people, not projects.
Plumbing is easier than you think. Learn to do it yourself.
Related to the above, read Heinlein’s quote on specialization. It is for insects. Learn to do everything.
Stress kills. Get sleep.
Don’t take advice from strangers on the internet :)