Links
Math StackExchange: https://math.stackexchange.com
Math Overflow: https://mathoverflow.net
zbMath: https://zbmath.org/
Mathscinet: https://mathscinet.ams.org/mathscinet/index.html
ArXiv: https://arxiv.org/
Fórum de Pesquisa e Pos-graduação - Matemática e Estatística: https://groups.google.com/u/1/a/impa.br/g/forumppg
Upcoming conferences in algebraic geometry (Ravi Vakil's page): https://math.stanford.edu/~vakil/conferences.html
Seminários do IMPA: https://institucional.impa.br/seminarios/lista.action#hoje
GeCo GeDi project: https://gecogedi.dimai.unifi.it/
Unión Matemática de América Latina y el Caribe: http://www.umalca.org/
My refer link to Online LaTeX Editor Overleaf: https://www.overleaf.com?r=28eadcf9&rm=d&rs=b