I do not know what plan is suitable for me. I am a retired teacher. I think a very simple plan for me should be enough. Can you give me any suggestion?
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What will you be using the software for?
Video editing? Photo editing? Animation?
you should consider photoshop elements and premiere elements, which are one time purchases, https://www.adobe.com/products/photoshop-elements/buy-elements.html?sdid=WB99JHFM&mv=search&mv2=paid...
if those don't meet your needs, you'll require a subscription. most subscriptions can be seen in the @John T Smith message. the least expensive is the photography plan (photoshop and lightroom).