If you get the flu, you do get natural immunity (or a percentage at least) from it, but it evolves and mutates so quick, if you get it again, you are likely getting a different strain than you did before - even though you get the same symptoms.
Yes, a flu shot is only good for the known flu strains it contains.
There are different types of flu though which affect different parts of the body. You can get a head cold, or a sore throat, or coughing, sore joints and muscles, etc etc depending on what the flu is. I believe covid affects the lungs and respiratory system - which is why it is knocking over elderly because they are more likely to have underlying respiratory problems.
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