Trump a liar, slow learner, or both?

It took Republican presidential hopeless Donald Trump 5 years to finally figure out that President Obama was born here in the United States. The evidence was obvious from day one, and no new information has surfaced, but all of a sudden Trumpy “got” it. Is he such a slow learner, or was he actually lying about it all along, – including “unbelievable” findings by his imaginary “investigators” in Hawaii?
What about climate change? Doesn’t he understand, or at least accept, what just about every climate scientist across the globe agree upon, not to mention the growing evidence? Or, does he lie about that, too?
What about President Obama’s accomplishments and Democratic nominee Hillary Clinton’s qualifications for the job? Doesn’t he get it, or does he simply lie about it all to fool his intellectually challenged followers?
Finally, does he really believe what he preaches, – about cutting taxes, debt and deficits, while expanding the military, providing jobs for everybody, making everybody richer, scrapping Obamacare, NATO and UN and sending “illegals” young and old out of the country? Or, is that, too, just a bunch of lies and read meat for his uneducated followers?
Can we believe anything that comes out of his mouth, – whether backed by tweets, or not?
Is he constantly lying, – or is he just a slow learner?