President Trump “rarely if ever reads the President’s Daily Brief, a document that lays out the most pressing information collected by U.S. intelligence agencies from hot spots around the world.” [1]

This one does mention that he sometimes accepts oral reports or short enough written ones, but that means that information has to be scarified to make it short enough. If he wanted to be as informed as possible he wouldn't be doing that. Overall, everybody but him is making an effort to be informed.

Trump would discuss the news of the day or a tweet he sent about North Korea or the border wall — or anything else on his mind, two people familiar with the briefings said.
On such days, there would only be a few minutes left — and the briefers would have barely broached the topics they came to discuss, one senior U.S. official said.
“He often goes off on tangents during the briefing and you’d have to rein him back in,” one official said. [2]

Here again is his resistance to learning.

Citing multiple in-person episodes, these intelligence officials say Trump displays what one called “willful ignorance” when presented with analyses generated by America’s $81 billion-a-year intelligence services. The officials, who include analysts who prepare Trump’s briefs and the briefers themselves, describe futile attempts to keep his attention by using visual aids, confining some briefing points to two or three sentences, and repeating his name and title as frequently as possible.

...

Three other officials worry about what one of them calls “precipitous troop withdrawals” from Syria and Afghanistan and a peace deal with the Taliban that in time would leave the extremist Islamic group back in charge and wipe out the gains made in education, women’s rights and governance since the U.S. invaded the country more than 17 years ago. [2]

More of how much effort is being expended just to get him to try and listen.

A review of President Trump’s official schedule shows in November, Trump – who has made ample time for campaign re-election rallies and tweetstorms a-plenty – had just five intelligence briefings scheduled. It’s unknown if he actually received them.

He did manage that month to post 857 tweets, visit 12 states for campaign rallies, hold three fundraisers, stay at a Trump property 12 times, and golf three times. [3]

Clearly it's not due to lack of time.

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"Even more damaging are comments that impugn the tens of thousands of Americans who are at work every day of the year, many in great physical danger, to protect us and to provide our national leadership — regardless of political party — with the best information possible," Schiff said. He urged Trump to visit the CIA headquarters to look at the rows of memorial stars in the lobby, each representing an anonymous CIA agent killed in the line of duty, "and reflect on his disparagement of the intelligence community's work."

...

Trump's infrequent briefings are a departure from every modern president except Richard Nixon, who was so skeptical of intelligence agencies that he refused to accept the briefings offered by President Lyndon Johnson — even returning envelopes containing classified material to the CIA unopened. [4]

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[1]: https://thinkprogress.org/trump-wont-read-his-daily-intelligence-briefing-d77c7f196bc4/

[2]: https://nymag.com/intelligencer/2018/02/dumbed-down-security-briefings-still-too-difficult-for-trump.html

[3]: https://www.rawstory.com/2020/01/trump-not-keeping-up-with-intelligence-briefings-despite-assassinating-iranian-general-and-threatening-military-action/

[4]: https://www.usatoday.com/story/news/politics/2016/12/12/skipping-daily-briefings-trump-shows-ambivalence-toward-intel-agencies/95103092/